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Proceedings Paper

Continuous-variable experiments with optical qubits
Author(s): Sergey A. Babichev; Juergen Appel; Alexander I. Lvovsky
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Paper Abstract

We present experimental homodyne tomography of an optical quantum bit represented by a single photon split into two optical modes. 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 qubit 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. We also show that a homodyne measurement on just one of the modes leads to remote preparation of a single-rail optical qubit in the other mode.

Paper Details

Date Published: 11 January 2005
PDF: 9 pages
Proc. SPIE 5631, Quantum Optics and Applications in Computing and Communications II, (11 January 2005); doi: 10.1117/12.577717
Show Author Affiliations
Sergey A. Babichev, Univ. of Calgary (Canada)
Univ. Konstanz (Germany)
Juergen Appel, Univ. of Calgary (Canada)
Univ. Konstanz (Germany)
Alexander I. Lvovsky, Univ. of Calgary (Canada)
Univ. Konstanz (Germany)


Published in SPIE Proceedings Vol. 5631:
Quantum Optics and Applications in Computing and Communications II
Guang-Can Guo; Hoi-Kwong Lo; Masahide Sasaki; Songhao Liu, Editor(s)

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