Quantum Multiplexing with the Orbital Angular Momentum of light

Details Quantum Multiplexing with the Orbital Angular Momentum of light Quantum Multiplexing with the Orbital Angular Momentum of light

2009-01-29

arxiv.org/abs/0901.4740v1

Phys. Rev. A 78, 062320 (2008)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.78.062320

The orbital angular momentum, OAM, of photons offers a suitable support to carry the quantum data of multiple users. We present two novel optical setups that send the information of n quantum communication parties through the same free-space optical link. Those qubits can be sent simultaneously and share path, wavelength and polarization without interference, increasing the communication capacity of the system. The first solution, a qubit combiner, merges n channels into the same link, which transmits n independent photons. The second solution, the OAM multiplexer, uses CNOT gates to transfer the information of n optical channels to a single photon. Additional applications of the multiplexer circuits, such as quantum arithmetic, as well as connections to OAM sorting are discussed.

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