Linear optical scheme for direct implementation of a nondestructive N-qubit controlled phase gate

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.044305· OSTI ID:20863993

Xubo, Zou; Ke, Li; Guangcan, Guo ^[1]

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1. Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026 (China)

We propose a linear optical scheme for direct realization of a nondestructive N-qubit controlled phase gate without resorting to a sequence of single- and two-qubit gates. The proposed setup involves linear optical elements, nonmaximally entangled pairs of photons, and multiphoton coincidence detection. To implement the scheme, physical qubits represented by the polarization states of single photons are probabilistically encoded into the two-photon states. Based on such encoding operation, a nondestructive N-qubit phase gate can be directly achieved by N-photon interference on an array of polarization beam splitters and N-photon coincidence detection.

• OSTI ID: 20863993
• Journal Information: Physical Review. A, Vol. 74, Issue 4; Other Information: DOI: 10.1103/PhysRevA.74.044305; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DETECTION
GATING CIRCUITS
IMPLEMENTATION
INTERFERENCE
MULTI-PHOTON PROCESSES
OPERATION
OPTICS
PHOTONS
POLARIZATION
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUBITS