2020/06/16 by Mateusz Szatkowski, Julian Koechlin, Dorilian Lopez-Mago · 4 citations
Computer Science · Engineering · Physics and Astronomy · #Computer science #Electronic engineering #Engineering #Mechanical and Optical Resonators #Orbital Angular Momentum in Optics #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Qubit #Swap (finance) #eess.SP #physics.optics
paper · pdf · doi:10.1016/j.optlastec.2020.106516
published in Optics & Laser Technology 133, 106516 (Elsevier BV)
arxiv created 2020/06/16 · openalex publication_date 2020/09/16 · arxiv updated 2020/12/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The implementation of optical quantum gates comes at the cost of incorporating a source of nonclassical light, which suffers from a low flux of photons, and thus, long acquisition times. Quantum-mimetic optical gates combine the benefits of quantum systems with the convenience of using intense light beams. Here, we are concerned with the classical implementation of a controlled-SWAP (c-SWAP) gate using the tools of structured light. A c-SWAP gate is a three-qubit gate, where one of the input qubits controls the exchange of information between the other two qubits. We use Laguerre-Gauss beams to realize the c-SWAP gate and demonstrate one of its primary applications: the comparison of two signals without revealing their content, i.e., a simultaneous message-passing protocol. We achieve signal-comparison measurements with modulation speeds of kHz using a digital micromirror device as a spatial light modulator. Our system is capable of performing dynamic error analysis and a normalization procedure, which overcomes the necessity of data postprocessing and largely reduces comparison times.