Universal unitary gate for single-photon 2-qubit states

Details Universal unitary gate for single-photon 2-qubit states Universal unitary gate for single-photon 2-qubit states

2001-01-16

arxiv.org/abs/quant-ph/0101064v1

Physical Review A, vol. 63, 2001, art. no. 032303 (10 pages)

Physics

Quantum Physics

to appear in Phys. Rev. A, 10 pages, 7 figures, 2 tables

Scientific paper

10.1103/PhysRevA.63.032303

Upon entangling a spatial binary alternative of a photon with its polarization, one can use single photons to study arbitrary 2-qubit states. Sending the photon through a Mach-Zehnder interferometer, equipped with sets of wave plates that change the polarization, amounts to performing a unitary transformation on the 2-qubit state. We show that any desired unitary gate can be realized by a judicious choice of the parameters of the set-up and discuss a number of applications. They include the diagnosis of an unknown 2-qubit state, an optical Grover search, and the realization of a thought experiment invented by Vaidman, Aharonov, and Albert.

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