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Scientists demonstrate all-fibre quantum logic
May 29, 2009A team of physicists and engineers have demonstrated all-fibre quantum logic, where single photons are generated and used to perform the contolled-NOT quantum logic gate in optical fibres with high fidelity.
The only quantum technology in practical use today is quantum cryptography and is currently limited in the distance over which secure communication may occur.
More sophisticated quantum networks will require multiple nodes with the ability to implement small-scale quantum processing in order to increase the range of quantum communications. Such networks will rely on optical fibre links, making fibre-based photon generation and information processing of key technological importance.
Jeremy O'Brien, Professor of Physics and Electrical Engineering at Bristol University and colleagues, have shown it is possible for a high-fidelity fibre controlled-NOT gate to operate with fibre heralded single-photon sources.
Professor O'Brien speaking about the research, said: "On the basis of a simple model we are able to conclude that imperfections are primarily due to the photon sources, meaning that the gate itself works with very high fidelity."
"Such all fibre quantum information processing will likely have important applications in future quantum networks."
All-fibre quantum information processing could be used in less mature quantum technologies such as computing, communication and advanced measurement, as well as in the fundamental science of quantum optics.
University of Bristol
Jeremy O'Brien, Professor of Physics and Electrical Engineering at Bristol University and colleagues, have shown it is possible for a high-fidelity fibre controlled-NOT gate to operate with fibre heralded single-photon sources.
Professor O'Brien speaking about the research, said: "On the basis of a simple model we are able to conclude that imperfections are primarily due to the photon sources, meaning that the gate itself works with very high fidelity."
"Such all fibre quantum information processing will likely have important applications in future quantum networks."
All-fibre quantum information processing could be used in less mature quantum technologies such as computing, communication and advanced measurement, as well as in the fundamental science of quantum optics.
University of Bristol
Quantum Logic Current Events and Quantum Logic News RSSDiamonds may be the ultimate MRI probe, say Quantum physicists
Diamonds, it has long been said, are a girl's best friend. But a research team including a physicist from the National Institute of Standards and Technology (NIST) has recently found that the gems might turn out to be a patient's best friend as well.
Ytterbium gains ground in quest for next-generation atomic clocks
An experimental atomic clock based on ytterbium atoms is about four times more accurate than it was several years ago, giving it a precision comparable to that of the NIST-F1 cesium fountain clock, the nation's civilian time standard, scientists at the National Institute of Standards and Technology (NIST) report in Physical Review Letters.
Manipulating light on a chip for quantum technologies
A team of physicists and engineers at Bristol University has demonstrated exquisite control of single particles of light - photons - on a silicon chip to make a major advance towards long-sought-after quantum technologies, including super-powerful quantum computers and ultra-precise measurements.
Fast quantum computer building block created
The fastest quantum computer bit that exploits the main advantage of the qubit over the conventional bit has been demonstrated by researchers at University of Michigan, U.S. Naval Research Laboratory and the University of California at San Diego.
Future 'quantum computers' will offer increased efficiency... and risks
An unusual observation in a University of Central Florida physics lab may lead to a new generation of "Quantum Computers" that will render today's computer and credit card encryption technology obsolete.
Computing breakthrough could elevate security to unprecedented levels
By using pulses of light to dramatically accelerate quantum computers, University of Michigan researchers have made strides in technology that could foil national and personal security threats.
Thousands of atoms swap 'spins' with partners in quantum square dance
Physicists at the Commerce Department's National Institute of Standards and Technology (NIST) have induced thousands of atoms trapped by laser beams to swap "spins" with partners simultaneously.
NEC, JST and RIKEN successfully demonstrate world's first controllably coupled qubits
NEC Corporation, Japan Science and Technology Agency (JST) and the Institute of Physical and Chemical Research (RIKEN) have together successfully demonstrated the world's first quantum bit (qubit) circuit that can control the strength of coupling between qubits.
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A New Approach to Quantum Logic (Studies in Logic) by K Engesser (Author), D, M Gabbay (Author), D Lehmann (Author) This monograph is an investigation into certain new logical structures implicit in the formalism of quantum mechanics. Its message rests on two pillars. The first pillar is the dynamic view of propositions. Propositions are viewed as acting on states of the world and changing them rather than just being true or false in them. The second pillar is a logical enquiry into the nature of the states of a dynamic framework in general and thus the nature of physical states in particular. It turns out that a physical state viewed as a logical entity must encode other states and also itself. The main logical structures under investigation are that of an M-algebra and that of a holistic logic. In a sense to be made precise the latter structures reflect the 'holistic' nature of quantum... |
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BMV Quantum Subliminal CD Logic Aid: Improve Logical Thinking (Ultrasonic Subliminal Series) Program your subconscious mind to increase logic and develop your logical thinking skills. Create amazing results using state-of-the-art subliminal and brainwave entrainment technologies. Tune your brainwaves to specific frequencies by listening to this CD! Program your subconscious mind for positive lasting results, created by a Certified Hypnotherapist and NLP Practitioner (Neuro-Linguistic Programming). Silent affirmations, inaudible hypnotic suggestions and thousands of powerful subliminal messages program your subconscious mind for positive results. The first 3 tracks have an ocean background. The Silent Ultrasonic Track 4 is completely silent with no sound at all! BMV exclusive Quantum Subliminal Matrix Technology sets a new standard for the subliminal industry! BMV has merged... |
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