Abstract
Insights gained from quantum physics can inspire novel classical technologies. These quantum-inspired technologies are protocols that aim at mimicking particular features of quantum algorithms. They are generally easier to implement and make use of intense beams. Here we demonstrate in a proof-of-concept experiment a quantum-inspired protocol based on the idea of quantum fingerprinting (Phys. Rev. Lett. 87, 167902, 2001).The carriers of information are optical beams with orbital angular momentum (OAM). These beams allow the implementation of a Fredkin gate or polarization-controlled SWAP operation that exchanges data encoded on beams with different OAM. We measure the degree of similarity between waveforms and strings of bits without unveiling the information content of the data.
Highlights
The capacity to transmit and process classical and quantum information has experienced tremendous growth in the latest years [1]
At the quantum level they use single photons with the information embedded in their quantum state
A reversible logical gate that has received great attention is the Fredkin gate, or controlled-SWAP (c-SWAP) gate, introduced by Edward Fredkin in the context of computational models to perform any logical or arithmetic operation in the domain of reversible logic-based operations. This gate has three input bits and three output bits and swaps or not the last two bits depending on the value of the first bit that acts as control bit [3]
Summary
The capacity to transmit and process classical and quantum information has experienced tremendous growth in the latest years [1]. One promising direction to handling increasingly huge sets of data is to build informationprocessing devices based on optical logic gates These gates make use of light beams with information encoded in their field amplitude and polarization. There has been the first demonstrations of a quantum Fredkin gate using linear optics with quantum-entangled photons [16,17,18] Speaking these implementations are probabilistic and experimentally cumbersome, requiring the use of multiple interferometers. We demonstrate in a proof-of-concept experiment a quantum-inspired protocol for comparing strings of data and waveforms without the need to unveil the information contained in the signals For implementing this gate, we translate key ideas and elements of the quantum fingerprinting protocol [31] to the classical domain. In the last few years a lot of attention has been directed towards using such beams for information transfer in the context of free-space communications [36, 37]
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