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Implementation of a simultaneous message passing protocol using optical vortices

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Document pages: 24 pages

Abstract: The implementation of optical quantum gates comes at the cost ofincorporating a source of nonclassical light, which suffers from a low flux ofphotons, and thus, long acquisition times. Quantum-mimetic optical gatescombine the benefits of quantum systems with the convenience of using intenselight beams. Here, we are concerned with the classical implementation of acontrolled-SWAP (c-SWAP) gate using the tools of structured light. A c-SWAPgate is a three-qubit gate, where one of the input qubits controls the exchangeof information between the other two qubits. We use Laguerre-Gauss beams torealize the c-SWAP gate and demonstrate one of its primary applications: thecomparison of two signals without revealing their content, i.e., a simultaneousmessage-passing protocol. We achieve signal-comparison measurements withmodulation speeds of kHz using a digital micromirror device as a spatial lightmodulator. Our system is capable of performing dynamic error analysis and anormalization procedure, which overcomes the necessity of data postprocessingand largely reduces comparison times.

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