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Volumn 82, Issue 6, 2010, Pages

Entangled coherent states versus entangled photon pairs for practical quantum-information processing

Author keywords

[No Author keywords available]

Indexed keywords

DECOHERENCE; DECOHERENCE EFFECTS; ENTANGLED COHERENT STATE; ENTANGLED PHOTON PAIRS; ENTANGLED STATE; INEFFICIENT DETECTORS; PHOTON LOSS; QUANTUM CHANNEL; QUANTUM-INFORMATION PROCESSING; REALISTIC CONDITIONS;

EID: 78650996404     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.82.062325     Document Type: Article
Times cited : (36)

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    • note
    • A direct comparison between arbitrary polarization qubits, μ | H + ν | V, and coherent-state qubits, μ | α + ν | - α, is not straightforward when α is small due to the nonzero overlap between the two component coherent states. It should be noted that we use the orthogonal basis, | + and | -, for coherent-state qubits in order to calculate the average fidelity for a "fair comparison" with the polarization-qubit case. In this sense, the input coherent-state qubit in comparison to the polarization qubit, μ | H + ν | V, should be considered to be μ | + + ν | -, rather than μ | α + ν | - α, when the overlap | α | - α | 2 is non-negligible.


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