Single-photon two-qubit "entangled'' states: preparation and measurement

Details Single-photon two-qubit "entangled'' states: preparation and measurement Single-photon two-qubit "entangled'' states: preparation and measurement

2003-03-19

arxiv.org/abs/quant-ph/0303125v2

Phys. Rev. A 67, 040301(R) (2003)

Physics

Quantum Physics

to appear in Phys. Rev. A, Rapid Communication (2003); A minor error correction on page 2 (superscripts in the last equation)

Scientific paper

10.1103/PhysRevA.67.040301

We implement experimentally a deterministic method to prepare and measure so called single-photon two-qubit entangled states or single-photon Bell-states, in which the polarization and the spatial modes of a single-photon each represent a quantum bit. All four single-photon Bell-states can be easily prepared and measured deterministically using linear optical elements alone. We also discuss how this method can be used for recently proposed single-photon two-qubit quantum cryptography protocol.

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