Homodyne tomography characterization and nonlocality of a dual-mode optical qubit

Details Homodyne tomography characterization and nonlocality of a dual-mode optical qubit Homodyne tomography characterization and nonlocality of a dual-mode optical qubit

2003-12-15

arxiv.org/abs/quant-ph/0312135v3

Physical Review Letters 92, 193601 (2004)

Physics

Quantum Physics

V2: rewritten according to referee comments

Scientific paper

10.1103/PhysRevLett.92.193601

A single photon, delocalized over two optical modes, is characterized by means of quantum homodyne tomography. The reconstructed four-dimensional density matrix extends over the entire Hilbert space and thus reveals, for the first time, complete information about the dual-rail optical quantum bit as a state of the electromagnetic field. The experimental data violate the Bell inequality albeit with a loophole similar to the detection loophole in photon counting experiments.

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