Quantum coherent systems and operations

A quantum coherent and measurement system technology, applied in the field of quantum coherent systems and operations, can solve problems such as wasting photons and auxiliary photons

Inactive Publication Date: 2008-05-28
HEWLETT PACKARD DEV CO LP
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Problems solved by technology

Although this method is scalable, it would require multiple iterations of individual gate operations until the computation is complete, wasting many entangled and auxiliary photons

Method used

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  • Quantum coherent systems and operations
  • Quantum coherent systems and operations
  • Quantum coherent systems and operations

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Embodiment Construction

[0025] According to one aspect of the present invention, nonlinear optical elements can efficiently perform quantum information processing tasks such as controlled phase shifting, non-absorbing state detection, non-absorbing Bell state analysis, heralded state preparation, non-absorbing encoding and Basic quantum gate operations such as controlled NOT (CNOT) gates. Direct exploitation of optical nonlinearities can amplify small phase shifts and exploit feed-forward systems in a near-deterministic manner with high operating efficiency.

[0026] Preferred embodiments of the present invention exploit nonlinear effects such as Electromagnetic Induced Transparency (EIT) to produce measurable phase shifts and can be achieved using waveguides and interaction sites such as EIT atoms, which can utilize nanoscale structures to manufacture. For example, R.G.Beausoleil, W.J.Munro and T.P.Spiller's "Coherent Particle Number Conversion in Quantum Information "Applications of CoherentPopul...

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Abstract

Nonlinear elements (200) can efficiently implement quantum information processing systems such as controlled phase shifters (400), non-absorbing detectors including parity detectors (1290), quantum subspace projections (600), non-absorbing Bell state analyzers (800), non-absorbing encoders / entanglers (1200), and fundamental quantum gates such as CNOT gates (1300). The non-absorbing detectors (1640, 1650) permit improvements in the efficiency of a probabilistic quantum gate (1720) by permitting reuse of the same photonic resources during multiple passes through the probabilistic gate (1720).

Description

Background technique [0001] Quantum information processing generally involves manipulating or using quantum states to store or communicate information or to perform computations. Various systems with quantum states have been proposed or used in quantum information processing. For example, optical systems can manipulate quantum states of light to perform specific quantum information processing tasks. [0002] Quantum computer architectures based on linear optical elements and feed-forward systems with nonlinearities induced by light detection were originally described by E. Knill, R. Laflamme, and G.J. Milburn in "A scheme for efficient quantum computing using linear optical components" ("A Scheme for Efficient Quantum Computation with Linear Optics," Nature 409, 47 (2001)). Although this proposal demonstrates that linear optics quantum computing (LOQC) is possible in principle, scalable systems based on this approach require impractically many quantum resources for reliable ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N1/00G06N99/00
CPCB82Y10/00G06N99/002G06N10/00
Inventor W·J·蒙罗T·P·斯皮勒K·内莫托
Owner HEWLETT PACKARD DEV CO LP
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