Quantum coherent systems and operations

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 ...

AI Technical Summary

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

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