The effect of focusing on polarization qubits

Details The effect of focusing on polarization qubits The effect of focusing on polarization qubits

2004-03-03

arxiv.org/abs/quant-ph/0403029v2

J. Mod. Opt. 52 (8) 1177-1188 (2005)

Physics

Quantum Physics

7 pages, RevTeX4, 2 eps figure; published version

Scientific paper

10.1080/09500340512331327570

When a photon with well-defined polarization and momentum passes through a focusing device, these properties are no longer well defined. Their loss is captured by describing polarization by a 3x3 effective density matrix. Here we show that the effective density matrix corresponds to the actual photodetection model and we provide a simple formula to calculate it in terms of classical fields. Moreover, we explore several possible experimental consequences of the "longitudinal" term: limits on single-photon detection efficiency, polarization-dependent atomic transitions rates and the implications on quantum information processing.

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