Continuous-variable experiments with optical qubits

Sergey A. Babichev; Juergen Appel; Alexander I. Lvovsky

doi:10.1117/12.577717

11 January 2005 Continuous-variable experiments with optical qubits

Sergey A. Babichev, Juergen Appel, Alexander I. Lvovsky

Proceedings Volume 5631, Quantum Optics and Applications in Computing and Communications II; (2005) https://doi.org/10.1117/12.577717
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

Sergey A. Babichev, Juergen Appel, and Alexander I. Lvovsky "Continuous-variable experiments with optical qubits", Proc. SPIE 5631, Quantum Optics and Applications in Computing and Communications II, (11 January 2005); https://doi.org/10.1117/12.577717

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