Phys. Rev. Lett. 93, 070502 (2004) [4 pages]Deterministic Controlled-NOT Gate For Single-Photon Two-Qubit Quantum LogicReceived 26 February 2004; published 11 August 2004 We demonstrate a robust implementation of a deterministic linear-optical controlled-not gate for single-photon two-qubit quantum logic. A polarization Sagnac interferometer with an embedded 45 °-oriented dove prism is used to enable the polarization control qubit to act on the momentum (spatial) target qubit of the same photon. The optical controlled-not gate requires no active stabilization because the two spatial modes share a common path, and it is used to entangle the polarization and momentum qubits. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.070502
DOI:
10.1103/PhysRevLett.93.070502
PACS:
03.67.Lx, 03.67.Mn, 42.50.Dv
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