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An Optical Quantum Computer that Uses Both Quantum Logic Gate and Quantum Annealing

Pushpendra Singh, Pathik Sahoo, C. S. Yadav +2 more

Lecture notes in networks and systemsJan 1, 20241 citation

Nondeterministic Logic Gates in Optical Quantum Computing

Federico M. Spedalieri, Jonathan P. Dowling, Hwang Lee

Federico M. Spedalieri, Jonathan P. Dowling, and Hwang Lee Abstract We present a detailed description of nondeterministic quantum logic gates: the crucial component of linear optical quantum computing. We use the qubits that are encoded in the polarization degrees of freedom, as opposed to the original dual-rail encoding. Employing the polarization-encoding scheme, we can avoid the undetected errors due to the inefficiency of the photodetectors and, therefore, achieve high gate fidelity, independent of the quantum efficiency of the detectors. Furthermore, we show that such a high-fidelity gate operation can be performed with no need of number-resolving detectors.Federico M. Spedalieri, Jonathan P. Dowling, and Hwang Lee Abstract We present a detailed description of nondeterministic quantum logic gates: the crucial component of linear optical quantum computing. We use the qubits that are encoded in the polarization degrees of freedom, as opposed to the original dual-rail encoding. Employing the polarization-encoding scheme, we can avoid the undetected errors due to the inefficiency of the photodetectors and, therefore, achieve high gate fidelity, independent of the quantum efficiency of the detectors. Furthermore, we show that such a high-fidelity gate operation can be performed with no need of number-resolving detectors.

Chapman & Hall/CRC eBooksSep 19, 20070 citations

An elementary optical logic circuit for quantum computing: a review

Ankur Saharia, Ravi Kumar Maddila, Jalil Ali +2 more

Optical and Quantum ElectronicsJun 22, 201920 citations

Nondeterministic gates for photonic single-rail quantum logic

Austin P. Lund, Timothy C. Ralph

We discuss techniques for producing, manipulating, and measuring qubits encoded optically as vacuum- and single-photon states. We show that a universal set of nondeterministic gates can be constructed using linear optics and photon counting. We investigate the efficacy of a test gate given realistic detector efficiencies.

arXiv:quant-ph/0205044Physical Review ASep 16, 200260 citations

Optical Qubits and Quantum Logic Operations

Sintayehu Tesfa

Lecture notes in physicsJan 1, 20200 citations

Demonstration of Nondeterministic Quantum Logic Operations Using Linear Optical Elements

T. B. Pittman, B. C. Jacobs, J. D. Franson

Knill, Laflamme, and Milburn [Nature (London) 409, 46 (2001)] recently showed that nondeterministic quantum logic operations could be performed using linear optical elements, additional photons (ancilla), and postselection based on the output of single-photon detectors. Here we report the experimental demonstration of two logic devices of this kind, a destructive controlled-NOT (CNOT) gate and a quantum parity check. These two devices can be combined with a pair of entangled photons to implement a conventional (nondestructive) CNOT that succeeds with a probability of 1/4.Knill, Laflamme, and Milburn [Nature (London) 409, 46 (2001)] recently showed that nondeterministic quantum logic operations could be performed using linear optical elements, additional photons (ancilla), and postselection based on the output of single-photon detectors. Here we report the experimental demonstration of two logic devices of this kind, a destructive controlled-NOT (CNOT) gate and a quantum parity check. These two devices can be combined with a pair of entangled photons to implement a conventional (nondestructive) CNOT that succeeds with a probability of 1/4.

arXiv:quant-ph/0109128Physical Review LettersJun 6, 2002188 citations

Nondeterministic Logic Gates in Optical Quantum Computing

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