Articles tagged with Quantum Information Processing
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Researchers investigate Mandelstam-Tamm limit, finding minimum time for quantum information change depends on energy uncertainty, and second speed limit emerges when energy uncertainty exceeds average energy of atom. This discovery proves fundamental limits to quantum computers' processing power.
Researchers have developed a room-temperature perovskite polariton parametric oscillator, enabling scalable and low-threshold nonlinear devices. This breakthrough offers possibilities for the development of cost-effective and integrated polaritonic devices.
Theorists at the University of Chicago have developed a new scheme for trapping single photons in a cavity, creating a 'wall' that prevents further photons from entering. This mechanism allows two sources to emit selected photons into a cavity before destructive interference cancels them out.
A recent study published in PRX Quantum reveals that quantum machine learning algorithms are hindered by excessive entanglement, leading to a phenomenon known as barren plateaus. By limiting depth and connectivity, researchers propose a solution to avoid these regimes and successfully train quantum neural networks.
Scientists demonstrate acoustic manipulation of electron spins in silicon carbide, enabling efficient control of magnetic quantum properties. The technique uses surface acoustic waves to tune the spin state, preventing information loss and paving the way for more affordable quantum technologies.
Researchers have developed a superconducting silicon-photonic chip for quantum communication, enabling optimal Bell-state measurement of time-bin encoded qubits. This breakthrough enhances the key rate of secure quantum communication and removes detector side-channel attacks, significantly increasing security.
Pasqal has published a paper in the APS Physics journal presenting a new machine learning protocol called Quantum Evolution Kernel (QEK) for measuring similarity between graph-structured data on quantum computers. QEK is stable against detection error and comparable to state-of-the-art graph kernels on classical systems.
Researchers used a supercomputer to emulate Google's quantum processor and discovered a reachability deficit, a performance limitation induced by a problem's constraint-to-variable ratio. The study showed that future experiments will require significantly more quantum resources to overcome this limit.
Researchers generate circularly polarized light at room temperature, a breakthrough for optical quantum information processing. The device uses strained semiconductors to produce twisting 'chiral' valley-polarized light, promising vast data storage capabilities.
Scientists detected electronic and optical interlayer resonances in bilayer graphene by twisting one layer 30 degrees, resulting in increased interlayer spacing that influences electron motion. This understanding could inform the design of future quantum technologies for more powerful computing and secure communication.
A UVA research group has developed a scalable quantum computing platform using photonic devices, reducing the number of devices needed to achieve quantum speed. The team created a quantum source in an optical microresonator on a chip, generating 40 qumodes and verifying the generation of multiplexed quantum modes.
Osaka University researchers demonstrate the readout of spin-polarized multielectron states composed of three or four electrons on a semiconductor quantum dot. This breakthrough may lead to quantum computers utilizing high-spin states, enabling faster and higher-capacity processing.
A UC Riverside materials scientist has received a $2 million grant to improve the scalability of quantum computers, allowing them to operate at room temperature. The project aims to create design guidelines and manufacturing strategies for hybrid organic-inorganic structures that can produce quantum computers on a larger scale.
The DTU researchers have developed a universal measurement-based optical quantum computer platform, enabling the execution of any arbitrary algorithm. The platform is scalable to thousands of qubits and can be connected directly to a future quantum Internet.
Researchers at Nagoya City University have detected strongly entangled pair of protons on a nanocrystalline silicon surface. This breakthrough could enable the creation of more qubits and ultra-fast processing for supercomputing applications, revolutionizing quantum computing.
Researchers have developed an unconventional method for controlling solid-state spin qubits using anti-Strokes (AS) excitation, which reduces the energy requirement compared to conventional Strokes excitation. This breakthrough enables improved quantum information processing and high-sensitivity quantum sensing capabilities.
The team achieved the first experimental demonstration of quantum information masking, a new protocol for transferring quantum information between multiple carriers. The fidelity of the entangled state was 97.7%, enabling secure transmission of simple images for three-party quantum secret sharing.
Researchers at KIT and Chimie ParisTech/CNRS create light-addressable qubit using europium(III) rare-earth ions, advancing quantum computer development. The molecule's nuclear spin levels can be polarized with light, enabling efficient processing of data in parallel.
A Swansea University scientist's research explores how geometrical characteristics affect physical theories, revealing the need for contextual understanding in quantum mechanics. The study determines the structural properties that make a theory prone to contextuality.
Researchers integrate nanodiamonds into nanophotonic circuits, controlling individual photons and spin states, enabling high-sensitivity magnetic field sensors and new applications in quantum technologies.
Researchers have discovered a method to prepare robust initial states in quantum information systems, minimizing unwanted transitions and preserving quantum information. This breakthrough could enable more complex operations in quantum computing.
A research team has discovered a remarkable echo effect in phosphorus atoms on silicon, allowing for the detection of multiple spin echoes. This effect is due to strong coupling between atomic spins and microwave photons, enabling the processing of quantum information.
Researchers have successfully observed the interaction of two time crystals, a major breakthrough that could lead to applications in quantum information processing. The discovery showcases controlled interactions between time crystals, a crucial step towards harnessing their potential.
Researchers at Aalto University have successfully demonstrated the quantum-mechanical interaction of two time crystals, a breakthrough that could enable the construction of a quantum computer operating at room temperature. The experiment involved exchanging magnetic quantum excitations, or magnons, between the two time crystals.
MIT researchers develop an on-off system that allows for low-error quantum computations and rapid sharing of quantum information between processors. The system uses 'giant atoms' made from superconducting qubits, enabling high-fidelity operations and interconnection between processors.
Army researchers have developed a new way to protect and safeguard quantum information, allowing for more efficient and secure communication. By understanding and removing certain types of noise in quantum channels, the team can convert bad noise into good noise with the addition of a cheap extra component.
Researchers at OIST have created a new platform for quantum information processing using Rydberg atoms near nanometer-thin optical fibers. The ability to control these hyper-sensitive atoms could revolutionize material and drug discoveries and provide more secure quantum communication.
Scientists have demonstrated tunable coherent phonon dynamics in nanomechanical resonators, enabling new possibilities for information storage and processing. The work shows high cooperativity and large coupling strength between non-neighbouring phonon modes.
Researchers from Chinese Academy of Sciences have successfully demonstrated diabolical points (DPs) in two strongly coupled microdisks with embedded quantum dots. The system enables a controllable phase shift between the microdisks, indicating potential applications in directional laser and quantum phase control.
A new protocol enables better measurement and comparison of multiple quantum states across devices and time, improving quantum information processing.
Researchers at University of Warwick develop protocol to measure how close a quantum computer's answer is to correct ones. This helps confirm if quantum computer has outperformed classical computers, so-called quantum supremacy.
University of Illinois researchers Kwiat and Kaneda have built a single-photon source that produces 30 photons at unprecedented efficiencies. By using time multiplexing, they reduced the loss rate to 1.2 percent per cycle, guaranteeing at least one photon pair production per run.
Scientists demonstrate a new type of quantum device using a silicon carbide photonic integrated chip that can be tunable, paving the way for next-generation quantum information processing devices. The approach overcomes some of the fragility drawbacks of previously reported SiC platforms.
Purdue University researchers have built a gate that manipulates quantum information in a predictable and deterministic way, enabling efficient and stable quantum information processing. The gate creates one of the largest entangled states of quantum particles to date, using four qudits encoded in only two photons.
Researchers at Rensselaer Polytechnic Institute have discovered a way to manipulate tungsten diselenide to enable faster, more efficient computing and quantum information processing. The findings lay the foundation for future development of next-generation computing and storage devices.
Researchers from Nanyang Technological University and Griffith University have developed a prototype quantum device that can examine all possible futures by placing them in a quantum superposition. This allows for the simulation of statistical futures and could enable more efficient learning in artificial intelligence algorithms.
Researchers have demonstrated proof-of-principle for an all-photonic quantum repeater, a critical step in long-distance quantum communication. This technology could enable faster and more secure global quantum Internet applications.
The researchers successfully demonstrated a new level of control over photons encoded with quantum information, performing distinct operations on two qubits in parallel. This breakthrough enables universal quantum computing and improves energy efficiency, stability, and control.
Scientists at Institute for Basic Science achieved a breakthrough in shielding quantum properties by packing two atoms together, protecting fragile states 20 times longer than one atom. This development enables the exploration of single atoms as quantum bits for future information processing.
A team of physicists at the University of Konstanz has developed a theoretical concept to shield electric and magnetic noise, extending the coherence time of spin qubits. This enables thousands of computer operations to be carried out in fractions of a second, paving the way for more efficient quantum computing.
Researchers have developed a topological photonic chip to process quantum information, demonstrating high-fidelity quantum interference and paving the way for scalable quantum computers. The breakthrough could lead to new materials, generation computers, and deeper understanding of fundamental science.
The team's device can produce one billion electrons per second and uses quantum mechanics to control them. This breakthrough paves the way for future quantum information processing applications, including defence, cybersecurity and encryption.
A team of researchers has demonstrated a novel method for splitting light beams into their frequency modes, allowing for the encoding of photons with quantum information. This breakthrough enables the creation of complex frequency states, which is crucial for quantum simulations and computations.
Researchers at Bar-Ilan University have introduced a method that overcomes the speed limit of quantum communication, enabling data transfer to increase by more than 5 orders of magnitude. This breakthrough uses direct optical nonlinearity to process quantum information in the optical regime, preserving its enormous bandwidth.
Researchers develop a new approach to analyze and reduce quantum noise in atomic systems, known as spin squeezing, which enhances measurement reliability at the quantum scale. The method involves redistributing uncertainty between two components of spin, improving precision and potentially enabling future quantum networks.
ICFO researchers have successfully connected two distinct quantum nodes using a single photon, demonstrating the feasibility of hybrid quantum networks. This breakthrough enables secure data transmission and advanced computing capabilities.
Scientists create dense ensembles of quantum spins in diamond with high resolution, enabling enhanced sensors and resources for quantum technologies. Nitrogen-Vacancy (NV) defects are used to measure magnetic fields and quantum computing, thanks to their unique properties such as long coherence times at room temperature.
Researchers found that improving quantum heat engine efficiency requires reducing photons in a cavity, enabling increased quantum manipulation power and accelerating quantum information processing. The study showed that only small photon numbers yield high efficiency and output power.
Researchers at MIT have successfully created a platform to store and process quantum information using ultracold molecules, which can retain their information for hundreds of times longer than previously achieved. The breakthrough could enable thousands of quantum computations in sequence within a second of coherence.
Researchers from Tsinghua University and Southern University of Science and Technology successfully experimentally studied the Forrelation problem in a 3-qubit nuclear magnetic resonance quantum information processor. The study aimed to find the largest possible separation between quantum and classical query complexities, with potentia...
Physicists use a new measurement technique to observe Alice winning and losing a quantum race simultaneously, verifying superposition. This breakthrough opens up new areas for study in quantum mechanics, including the role of causal relations.
Researchers have discovered that quantum devices can process information more efficiently than classical devices by harnessing quantum theory. This breakthrough could lead to significant advancements in fields such as artificial intelligence and machine learning.
Physicists have created a technique to improve the production of single photons, which can be used for quantum computing and secure communication. The new method uses fibre-optics and optical switches to control photon properties.
Scientists discovered that defect states can be used to detect occupation of trap sites, enabling new studies on developing novel technologies. They found that coherent microwave fields can dynamically mediate the occupation of defects states, consistent with two-level systems.
Purdue University researchers have successfully controlled the electron spin of a levitated nanodiamond using lasers in a vacuum, enabling potential applications in quantum information processing, sensors, and fundamental physics studies. The technique could also be used to detect and measure gases, such as oxygen, with improved accuracy.
Mun Dae Kim wins inaugural award for his work on superconducting flux qubits, increasing effective coupling strength for quantum computation; honors Dr. Howard E. Brandt, journal's late editor-in-chief.
Scientists have developed a novel method to control the Berry phase of a quantum state in a nitrogen-vacancy center in diamond, enabling robust quantum logic operations. The approach uses laser light to draw paths for the defect's spin, resulting in insensitive behavior to noise sources.
Researchers from the University of Warsaw have discovered a way to tailor the energy spectrum of an iron atom to obtain a doubly degenerate ground state with non-zero magnetic moment. This achievement enables the storage and processing of quantum information, making it suitable for applications in spintronics and solotronics.
Researchers developed a novel method to confine light, allowing for the retention of quantum memories encoded in photons. This breakthrough could lead to hybrid devices using quantum information for communication networks or quantum computing.
An international team of researchers reviewed theoretical ideas on quantum teleportation, concluding a hybridisation of protocols is the most fruitful approach. This could lead to more efficient and reliable teleportation systems for quantum computing, communication, and network development.