# Quantum Information Current Events

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Slicing optical beams: Cryptographic algorithms for quantum networks

The mathematical models can be used not only for quantum networks and authentication but also for full-scale quantum computing. Quantum hashing can help protect quantum algorithms against mistakes. Relevant research is currently in progress at Kazan Federal University. (2018-12-13)

Quantum algorithm breakthrough

An international research group led by scientists from the University of Bristol, UK, and the University of Queensland, Australia, has demonstrated a quantum algorithm that performs a true calculation for the first time. Quantum algorithms could one day enable the design of new materials, pharmaceuticals or clean energy devices. (2013-02-24)

UCSB physicists demonstrate the quantum von Neumann architecture

A new paradigm in quantum information processing has been demonstrated by physicists at UC Santa Barbara. Their results are published in this week's issue of Science Express online. (2011-09-01)

Unpolarized single-photon generation with true randomness from diamond

The Tohoku University research group of Professor Keiichi Edamatsu and Postdoctoral fellow Naofumi Abe has demonstrated dynamically and statically unpolarized single-photon generation using diamond. (2017-05-08)

Quantum algorithm proposed to solve Dyck language problems

In the paper, Khadiev and his colleagues demonstrated an algorithm that can solve the problem in 40 seconds and also proved that it cannot be solved in less than 10 second on a quantum computer. (2020-09-04)

2 qubits in action, new step towards the quantum computer

Researchers at Delft University of Technology have succeeded in carrying out calculations with two quantum bits, the building blocks of a possible future quantum computer. The Delft researchers are publishing an article about this important step towards a workable quantum computer in this week's issue of Nature. (2007-06-14)

Scientists demonstrate all-fiber quantum logic

A team of physicists and engineers have demonstrated all-fiber quantum logic, where single photons are generated and used to perform the controlled-NOT quantum logic gate in optical fibers with high fidelity. (2009-05-28)

Quantum cryptography

Quantum cryptography is often advertised as the answer to classical cryptographers' nightmares, since it gives a way of sending secret messages which is guaranteed by the laws of quantum theory to be secure. But, while quantum theory has been confirmed in an impressive variety of experiments, many distinguished physicists have nonetheless suggested that it may well turn out to be incomplete and will eventually be superseded. What then? (2005-07-05)

Quantum systems correct themselves

Quantum devices allow us to accomplish computing and sensing tasks that go beyond the capabilities of their classical counterparts. However, protecting quantum information from being corrupted by errors is difficult. (2017-11-28)

CCNY & partners in quantum algorithm breakthrough

Researchers led by City College of New York physicist Pouyan Ghaemi report the development of a quantum algorithm with the potential to study a class of many-electron quantums system using quantum computers. Their paper, entitled ''Creating and Manipulating a Laughlin-Type ν=1/3 Fractional Quantum Hall State on a Quantum Computer with Linear Depth Circuits,'' appears in the December issue of

APS Tip Sheet: Improving quantum information processing

A new protocol compares the closeness of quantum states in information sent from different devices. (2020-01-08)

Filming quantic measurement for the first time

The measurement of a strontium ion lasts barely a millionth of a second but the researchers have managed to make a 'film' of the process by reconstructing the quantum state of the system at different moments. The results confirm one of the most subtle predictions in quantum physics. (2020-05-12)

Quantum copies do new tricks

A paper published in Physical Review Letters (PRL), by Sadegh Raeisi, Wolfgang Tittel and Christoph Simon of the Institute for Quantum Information Science at the University of Calgary shows that it is possible to perfectly recover the original from the imperfect quantum copies. They also propose a way that his could be done in practice. (2012-03-22)

Quantum leap for Einstein's scientific principle

How Einstein's equivalence principle extends to the quantum world has been puzzling physicists for decades, but a team including a University of Queensland researcher has found the key to this question. UQ physicist, Dr Magdalena Zych from the ARC Centre of Excellence for Engineered Quantum Systems, and the University of Vienna's Professor Caslav Brukner have been working to discover if quantum objects interact with gravity only through curved space-time. (2018-08-20)

'Elegance and Enigma'

Quantum mechanics is one of mankind's most remarkable intellectual achievements. Stunningly successful and elegant, it challenges our deepest intuitions about the world. In Elegance and Enigma, seventeen physicists and philosophers, all deeply concerned with understanding quantum mechanics, reply to Maximilian Schlosshauer's penetrating questions about the central issues. They grant us an intimate look at their radically different ways of making sense of the theory's strangeness. (2011-08-05)

Quantum simulation with light: Frustrations between photon pairs

Researchers of the University of Vienna used a quantum mechanical system in the laboratory to simulate complex many-body systems. This experiment promises future quantum simulators enormous potential insights into unknown quantum phenomena. (2011-05-05)

RMIT researchers make leap in measuring quantum states

Researchers have developed self-guided quantum tomography which uses a search algorithm to iteratively 'find' the quantum state. This technique significantly reduces the necessary resources by removing the need for any data storage or post-processing. (2016-07-21)

Is quantum computing scalable?

Debbie Leung, a fellow in CIFAR's Quantum Information Science program and a faculty member at the University of Waterloo's Institute for Quantum Computing, will discuss the challenges of scaling quantum computing at the AAAS meeting on Feb. 16. (2019-02-16)

Here A Beam, There A Beam

Physicists at the California Institute of Technology recently succeeded in transporting a quantum state of light from one side of an optical bench to the other without it traveling through any physical medium in between. (1999-01-21)

Researchers develop data bus for quantum computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications. (2017-11-06)

Cooling a 'massive' solid-state nanoparticle into its quantum ground state

In a study probing the boundary between the classical and quantum worlds, researchers laser-cooled a tiny glass nanoparticle with the density of a solid object to a quantum state. (2020-01-30)

Ranier Blatt wins Bell Prize for trailblazing quantum research

On Aug. 20th, 2015, world-renowned quantum physicist Rainer Blatt will be awarded a prestigious prize for his contributions to the development of quantum information technologies, during the Conference on Quantum Information and Quantum Control being held at the Fields Institute at the University of Toronto. (2015-08-10)

Arbitrary quantum channel simulation for a superconducting qubit

Recently, a research team led by Prof. Luyan Sun from Tsinghua University has successfully demonstrated the arbitrary quantum channel simulation for a single qubit in a superconducting quantum circuits, which could be used for simulating the evolution of a quantum bit in arbitrary physical environment. (2019-01-11)

Not 1, not 2, not 3, but 4 clones!

Chinese researchers have produced a theory for a quantum cloning machine able to produce several copies of the state of a particle at atomic or sub-atomic scale, or quantum state, in an article about to be published in EPJ D. This could have implications for quantum information processing methods used, for example, in message encryption systems. (2011-11-04)

Researchers realize efficient generation of high-dimensional quantum teleportation

In a study published in Physical Review Letters, the team led by academician GUO Guangcan from University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) made progress in high dimensional quantum teleportation. The researchers demonstrated the teleportation of high-dimensional states in a three-dimensional six-photon system. (2021-01-08)

Quantum research past, present and future for discussion at AAAS

A panel of quantum experts from three world-leading institutes will share their insights on quantum research, from its beginnings to its exciting future, in a moderated discussion at the American Association for the Advancement of Science. (2015-02-14)

Quantum holograms as atomic scale memory keepsake

A theoretical model of quantum memory for light, adapting the concept of a hologram to a quantum system has been published in EPJD. The authors demonstrate that it is theoretically possible to retrieve, on demand, a given portion of the stored quantized light signal of a holographic image -- set in a given direction in a given position in time sequence. This is done by shaping the control field both in space and time. (2014-10-21)

USTC realizes the first quantum-entangling-measurements-enhanced quantum orienteering

Researchers enhanced the performance of quantum orienteering with entangling measurements via photonic quantum walks. (2020-02-25)

Researchers discovered elusive half-quantum vortices in a superfluid

Researchers have discovered half-quantum vortices in superfluid helium. This vortex is a topological defect, exhibited in superfluids and superconductors, which carries a fixed amount of circulating current. These objects originally predicted to exist in superfluid helium in 1976. The discovery will provide access to the cores of half-quantum vortices, hosting isolated Majorana modes, exotic solitary particles. Understanding these modes is essential for the progress of quantum information processing, building a quantum computer. (2016-12-14)

Approximate quantum cloning: The new way of eavesdropping in quantum cryptography

Cloning of quantum states is used for eavesdropping in the context of quantum cryptography or for quantum computation. Uncertainty at the quantum scale makes exact cloning of quantum states impossible. Yet, they may be copied in an approximate way using a method called probabilistic quantum cloning, or PQC. In a new study published in EPJ D, Pinshu Rui from Anhui Xinhua and Anhui Universities, Hefei, China, and colleagues demonstrate that partial PQC is possible. (2018-02-20)

Playing quantum tricks with measurements

A team of physicists at the University of Innsbruck, Austria, performed an experiment that seems to contradict the foundations of quantum theory -- at first glance. The team led by Rainer Blatt reversed a quantum measurement in a prototype quantum information processor. The experiment is enabled by a technique that has been developed for quantum error correction in a future quantum computer. (2013-02-15)

Nobel prize winner Dr. Anthony Leggett merges quantum computing theory and application in new book

Kluwer Academic Publishers today announced the anticipated release of 2003 Nobel Prize winner Dr. Anthony Leggett's book Quantum Computing and Quantum Bits in Mesoscopic Systems. Co-edited with Dr. Berardo Ruggiero of the Instituto di Cibernetica del CNR in Italy and Dr. Paolo Silverstini of the Seconda Universita degli Studi di Napoli in Aversa, Italy, the book is heralded as a comprehensive work on theoretical quantum physics and a significant leap forward in its practical implementation. (2004-01-14)

Simultaneous detection of multiple spin states in a single quantum dot

Osaka University-led researchers achieved single-shot readout of three two-electron spin states of a single quantum dot. This is the first example of simultaneous detection of multiple spin states in a single quantum dot. The team measured the change in current of a quantum point contact charge sensor near a quantum dot, which depended on both spin state and spin-orbital interactions. Their findings represent a step forward on the path to realizing quantum computing. (2017-03-13)

Shining a light on quantum dots measurement

Using the cadmium selenide quantum dot, researchers at Syracuse University collaborated to understand how protein corona forms and what is different about the quantum dot before and after the formation of the corona. (2015-01-15)

Quantum optical hard drive breakthrough

Scientists developing a prototype optical quantum hard drive have improved storage time by a factor of over 100. The team's record storage time of six hours is a major step towards a secure worldwide data encryption network based on quantum information which could be used for banking transactions and personal emails. (2015-01-08)

A new quantum data classification protocol brings us nearer to a future 'quantum internet'

A new protocol created by researchers at the Universitat Autònoma de Barcelona sorts and classifies quantum data by the state in which they were prepared, with more efficiency than the equivalent classical algorithm. The research was published today in Physical Review X. (2019-11-08)

Researchers achieve multifunctional solid-state quantum memory

Research team from CAS Key Lab of Quantum Information developed multi-degree-of-freedom multiplexed solid-state quantum memory and demonstrate photon pulse operation functions with time and frequency degree-of-freedoms. (2018-08-24)

Experimental optimal verification of entangled states using local measurements

USTC modified the original proposal to be robust to practical imperfections, and experimentally implement a scalable quantum state verification on two-qubit and four-qubit entangled states with nonadaptive local measurements. The research results were published in Physical Review Letters on July 17th. (2020-07-24)

Quantifying how much quantum information can be eavesdropped

Summary The most basic type of quantum information processing is quantum entanglement. In a new study published in EPJ B, Zhaonan Zhang from Shaanxi Normal University, Xi'an, China, and colleagues have provided a much finer characterisation of the distributions of entanglement in multi-qubit systems than previously available. These findings can be used in quantum cryptography to estimate the quantity of information an eavesdropper can capture regarding the secret encryption key. (2019-01-28)

Dramatic simplification paves the way for building a quantum computer

An international research group led by scientists from the University of Bristol, UK, has demonstrated a new technique that dramatically simplifies quantum circuits, bringing quantum computers closer to reality. (2011-08-02)

The mathematical models can be used not only for quantum networks and authentication but also for full-scale quantum computing. Quantum hashing can help protect quantum algorithms against mistakes. Relevant research is currently in progress at Kazan Federal University. (2018-12-13)

Quantum algorithm breakthrough

An international research group led by scientists from the University of Bristol, UK, and the University of Queensland, Australia, has demonstrated a quantum algorithm that performs a true calculation for the first time. Quantum algorithms could one day enable the design of new materials, pharmaceuticals or clean energy devices. (2013-02-24)

UCSB physicists demonstrate the quantum von Neumann architecture

A new paradigm in quantum information processing has been demonstrated by physicists at UC Santa Barbara. Their results are published in this week's issue of Science Express online. (2011-09-01)

Unpolarized single-photon generation with true randomness from diamond

The Tohoku University research group of Professor Keiichi Edamatsu and Postdoctoral fellow Naofumi Abe has demonstrated dynamically and statically unpolarized single-photon generation using diamond. (2017-05-08)

Quantum algorithm proposed to solve Dyck language problems

In the paper, Khadiev and his colleagues demonstrated an algorithm that can solve the problem in 40 seconds and also proved that it cannot be solved in less than 10 second on a quantum computer. (2020-09-04)

2 qubits in action, new step towards the quantum computer

Researchers at Delft University of Technology have succeeded in carrying out calculations with two quantum bits, the building blocks of a possible future quantum computer. The Delft researchers are publishing an article about this important step towards a workable quantum computer in this week's issue of Nature. (2007-06-14)

Scientists demonstrate all-fiber quantum logic

A team of physicists and engineers have demonstrated all-fiber quantum logic, where single photons are generated and used to perform the controlled-NOT quantum logic gate in optical fibers with high fidelity. (2009-05-28)

Quantum cryptography

Quantum cryptography is often advertised as the answer to classical cryptographers' nightmares, since it gives a way of sending secret messages which is guaranteed by the laws of quantum theory to be secure. But, while quantum theory has been confirmed in an impressive variety of experiments, many distinguished physicists have nonetheless suggested that it may well turn out to be incomplete and will eventually be superseded. What then? (2005-07-05)

Quantum systems correct themselves

Quantum devices allow us to accomplish computing and sensing tasks that go beyond the capabilities of their classical counterparts. However, protecting quantum information from being corrupted by errors is difficult. (2017-11-28)

CCNY & partners in quantum algorithm breakthrough

Researchers led by City College of New York physicist Pouyan Ghaemi report the development of a quantum algorithm with the potential to study a class of many-electron quantums system using quantum computers. Their paper, entitled ''Creating and Manipulating a Laughlin-Type ν=1/3 Fractional Quantum Hall State on a Quantum Computer with Linear Depth Circuits,'' appears in the December issue of

*PRX Quantum*, a journal of the American Physical Society. (2020-11-13)APS Tip Sheet: Improving quantum information processing

A new protocol compares the closeness of quantum states in information sent from different devices. (2020-01-08)

Filming quantic measurement for the first time

The measurement of a strontium ion lasts barely a millionth of a second but the researchers have managed to make a 'film' of the process by reconstructing the quantum state of the system at different moments. The results confirm one of the most subtle predictions in quantum physics. (2020-05-12)

Quantum copies do new tricks

A paper published in Physical Review Letters (PRL), by Sadegh Raeisi, Wolfgang Tittel and Christoph Simon of the Institute for Quantum Information Science at the University of Calgary shows that it is possible to perfectly recover the original from the imperfect quantum copies. They also propose a way that his could be done in practice. (2012-03-22)

Quantum leap for Einstein's scientific principle

How Einstein's equivalence principle extends to the quantum world has been puzzling physicists for decades, but a team including a University of Queensland researcher has found the key to this question. UQ physicist, Dr Magdalena Zych from the ARC Centre of Excellence for Engineered Quantum Systems, and the University of Vienna's Professor Caslav Brukner have been working to discover if quantum objects interact with gravity only through curved space-time. (2018-08-20)

'Elegance and Enigma'

Quantum mechanics is one of mankind's most remarkable intellectual achievements. Stunningly successful and elegant, it challenges our deepest intuitions about the world. In Elegance and Enigma, seventeen physicists and philosophers, all deeply concerned with understanding quantum mechanics, reply to Maximilian Schlosshauer's penetrating questions about the central issues. They grant us an intimate look at their radically different ways of making sense of the theory's strangeness. (2011-08-05)

Quantum simulation with light: Frustrations between photon pairs

Researchers of the University of Vienna used a quantum mechanical system in the laboratory to simulate complex many-body systems. This experiment promises future quantum simulators enormous potential insights into unknown quantum phenomena. (2011-05-05)

RMIT researchers make leap in measuring quantum states

Researchers have developed self-guided quantum tomography which uses a search algorithm to iteratively 'find' the quantum state. This technique significantly reduces the necessary resources by removing the need for any data storage or post-processing. (2016-07-21)

Is quantum computing scalable?

Debbie Leung, a fellow in CIFAR's Quantum Information Science program and a faculty member at the University of Waterloo's Institute for Quantum Computing, will discuss the challenges of scaling quantum computing at the AAAS meeting on Feb. 16. (2019-02-16)

Here A Beam, There A Beam

Physicists at the California Institute of Technology recently succeeded in transporting a quantum state of light from one side of an optical bench to the other without it traveling through any physical medium in between. (1999-01-21)

Researchers develop data bus for quantum computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications. (2017-11-06)

Cooling a 'massive' solid-state nanoparticle into its quantum ground state

In a study probing the boundary between the classical and quantum worlds, researchers laser-cooled a tiny glass nanoparticle with the density of a solid object to a quantum state. (2020-01-30)

Ranier Blatt wins Bell Prize for trailblazing quantum research

On Aug. 20th, 2015, world-renowned quantum physicist Rainer Blatt will be awarded a prestigious prize for his contributions to the development of quantum information technologies, during the Conference on Quantum Information and Quantum Control being held at the Fields Institute at the University of Toronto. (2015-08-10)

Arbitrary quantum channel simulation for a superconducting qubit

Recently, a research team led by Prof. Luyan Sun from Tsinghua University has successfully demonstrated the arbitrary quantum channel simulation for a single qubit in a superconducting quantum circuits, which could be used for simulating the evolution of a quantum bit in arbitrary physical environment. (2019-01-11)

Not 1, not 2, not 3, but 4 clones!

Chinese researchers have produced a theory for a quantum cloning machine able to produce several copies of the state of a particle at atomic or sub-atomic scale, or quantum state, in an article about to be published in EPJ D. This could have implications for quantum information processing methods used, for example, in message encryption systems. (2011-11-04)

Researchers realize efficient generation of high-dimensional quantum teleportation

In a study published in Physical Review Letters, the team led by academician GUO Guangcan from University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) made progress in high dimensional quantum teleportation. The researchers demonstrated the teleportation of high-dimensional states in a three-dimensional six-photon system. (2021-01-08)

Quantum research past, present and future for discussion at AAAS

A panel of quantum experts from three world-leading institutes will share their insights on quantum research, from its beginnings to its exciting future, in a moderated discussion at the American Association for the Advancement of Science. (2015-02-14)

Quantum holograms as atomic scale memory keepsake

A theoretical model of quantum memory for light, adapting the concept of a hologram to a quantum system has been published in EPJD. The authors demonstrate that it is theoretically possible to retrieve, on demand, a given portion of the stored quantized light signal of a holographic image -- set in a given direction in a given position in time sequence. This is done by shaping the control field both in space and time. (2014-10-21)

USTC realizes the first quantum-entangling-measurements-enhanced quantum orienteering

Researchers enhanced the performance of quantum orienteering with entangling measurements via photonic quantum walks. (2020-02-25)

Researchers discovered elusive half-quantum vortices in a superfluid

Researchers have discovered half-quantum vortices in superfluid helium. This vortex is a topological defect, exhibited in superfluids and superconductors, which carries a fixed amount of circulating current. These objects originally predicted to exist in superfluid helium in 1976. The discovery will provide access to the cores of half-quantum vortices, hosting isolated Majorana modes, exotic solitary particles. Understanding these modes is essential for the progress of quantum information processing, building a quantum computer. (2016-12-14)

Approximate quantum cloning: The new way of eavesdropping in quantum cryptography

Cloning of quantum states is used for eavesdropping in the context of quantum cryptography or for quantum computation. Uncertainty at the quantum scale makes exact cloning of quantum states impossible. Yet, they may be copied in an approximate way using a method called probabilistic quantum cloning, or PQC. In a new study published in EPJ D, Pinshu Rui from Anhui Xinhua and Anhui Universities, Hefei, China, and colleagues demonstrate that partial PQC is possible. (2018-02-20)

Playing quantum tricks with measurements

A team of physicists at the University of Innsbruck, Austria, performed an experiment that seems to contradict the foundations of quantum theory -- at first glance. The team led by Rainer Blatt reversed a quantum measurement in a prototype quantum information processor. The experiment is enabled by a technique that has been developed for quantum error correction in a future quantum computer. (2013-02-15)

Nobel prize winner Dr. Anthony Leggett merges quantum computing theory and application in new book

Kluwer Academic Publishers today announced the anticipated release of 2003 Nobel Prize winner Dr. Anthony Leggett's book Quantum Computing and Quantum Bits in Mesoscopic Systems. Co-edited with Dr. Berardo Ruggiero of the Instituto di Cibernetica del CNR in Italy and Dr. Paolo Silverstini of the Seconda Universita degli Studi di Napoli in Aversa, Italy, the book is heralded as a comprehensive work on theoretical quantum physics and a significant leap forward in its practical implementation. (2004-01-14)

Simultaneous detection of multiple spin states in a single quantum dot

Osaka University-led researchers achieved single-shot readout of three two-electron spin states of a single quantum dot. This is the first example of simultaneous detection of multiple spin states in a single quantum dot. The team measured the change in current of a quantum point contact charge sensor near a quantum dot, which depended on both spin state and spin-orbital interactions. Their findings represent a step forward on the path to realizing quantum computing. (2017-03-13)

Shining a light on quantum dots measurement

Using the cadmium selenide quantum dot, researchers at Syracuse University collaborated to understand how protein corona forms and what is different about the quantum dot before and after the formation of the corona. (2015-01-15)

Quantum optical hard drive breakthrough

Scientists developing a prototype optical quantum hard drive have improved storage time by a factor of over 100. The team's record storage time of six hours is a major step towards a secure worldwide data encryption network based on quantum information which could be used for banking transactions and personal emails. (2015-01-08)

A new quantum data classification protocol brings us nearer to a future 'quantum internet'

A new protocol created by researchers at the Universitat Autònoma de Barcelona sorts and classifies quantum data by the state in which they were prepared, with more efficiency than the equivalent classical algorithm. The research was published today in Physical Review X. (2019-11-08)

Researchers achieve multifunctional solid-state quantum memory

Research team from CAS Key Lab of Quantum Information developed multi-degree-of-freedom multiplexed solid-state quantum memory and demonstrate photon pulse operation functions with time and frequency degree-of-freedoms. (2018-08-24)

Experimental optimal verification of entangled states using local measurements

USTC modified the original proposal to be robust to practical imperfections, and experimentally implement a scalable quantum state verification on two-qubit and four-qubit entangled states with nonadaptive local measurements. The research results were published in Physical Review Letters on July 17th. (2020-07-24)

Quantifying how much quantum information can be eavesdropped

Summary The most basic type of quantum information processing is quantum entanglement. In a new study published in EPJ B, Zhaonan Zhang from Shaanxi Normal University, Xi'an, China, and colleagues have provided a much finer characterisation of the distributions of entanglement in multi-qubit systems than previously available. These findings can be used in quantum cryptography to estimate the quantity of information an eavesdropper can capture regarding the secret encryption key. (2019-01-28)

Dramatic simplification paves the way for building a quantum computer

An international research group led by scientists from the University of Bristol, UK, has demonstrated a new technique that dramatically simplifies quantum circuits, bringing quantum computers closer to reality. (2011-08-02)

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