Universal quantum computation using all-optical hybrid encoding

doi:10.1088/1674-1056/24/4/040303

Abstract By employing displacement operations, single-photon subtractions, and weak cross-Kerr nonlinearity, we propose an alternative way of implementing several universal quantum logical gates for all-optical hybrid qubits encoded in both single-photon polarization state and coherent state. Since these schemes can be straightforwardly implemented only using local operations without teleportation procedure, therefore, less physical resources and simpler operations are required than the existing schemes. With the help of displacement operations, a large phase shift of the coherent state can be obtained via currently available tiny cross-Kerr nonlinearity. Thus, all of these schemes are nearly deterministic and feasible under current technology conditions, which makes them suitable for large-scale quantum computing.

Keywords: quantum computation linear optics cross-Kerr nonlinearities

Received: 29 July 2014
Revised: 16 November 2014
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	03.67.Lx	(Quantum computation architectures and implementations)
	42.50.Ex	(Optical implementations of quantum information processing and transfer)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61465013, 11465020, and 11264042).

Corresponding Authors: Zhang Shou
E-mail: szhang@ybu.edu.cn

Cite this article:

Guo Qi (郭奇), Cheng Liu-Yong (程留永), Wang Hong-Fu (王洪福), Zhang Shou (张寿) Universal quantum computation using all-optical hybrid encoding 2015 Chin. Phys. B 24 040303

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