Multi-pair two-component quantum entangled state micro-ring resonant cavity and preparation method thereof

Abstract

The invention provides a multi-pair two-component quantum entangled state micro-ring resonant cavity and a preparation method thereof. The micro-ring resonant cavity is composed of a coupling channel and a micro-ring, and the micro-ring is a micro-ring with a third-order nonlinear effect; and continuous light is used for pumping the micro-ring resonant cavity, pumping light enters the coupling channel from an input port provided by the coupling channel, part of the pumping light in the coupling channel is coupled into the micro-ring, multiple pairs of signal light and idle light are generated after interaction, and the generated multiple pairs of signal light and idle light meet the entanglement relation. The micro-ring resonant cavity disclosed by the invention can be made of a Si3N4 material with relatively high nonlinear coefficient, high integration level and stable performance. Simulation is carried out on the multi-pair double-component quantum entangled state preparation method provided by the invention, and it is verified that the high-quality multi-pair double-component quantum entangled state can be generated through the multi-pair double-component quantum entangled state preparation method.

Description

technical field [0001] The present invention relates to the technical fields of quantum optics, nonlinear optics and micro-nano optics, in particular to a microring resonator with multiple pairs of two-component quantum entangled states, and a method for preparing multiple pairs of quantum entangled states using the microring resonant cavity Design. Background technique [0002] Quantum entanglement is one of the most important features of quantum mechanics. It describes the correlation between particles that is not limited by distance. Two or more particles that have an entangled relationship, no matter how far apart these particles are in space, if When the state of one particle changes, the state of other particles will also change. Quantum entanglement is an essential quantum resource for many applications in quantum information processing, and is widely used in quantum precision metrology, quantum key distribution, quantum teleportation, and quantum dense coding. [0...

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Problems solved by technology

[0004] In 2007, S.E.Harris passed nonlinear crystal lithium niobate (LiNbO 3 ) prepared photon pairs satisfy time-energy entanglement over a wide frequency band, but this kind of entanglement source is relatively large in volume compared with the microring resonator, and it is difficult to integrate

In 2017, Michael Kues and others prepared a high-dimensional quantum entangled state through a microring resonator, but the entanglement source can only generate a pair of entangled states at the same time, and cannot generate multiple pairs of entangled states at the same time

In 2019, V.D.Vaidya and B.Morrison et al. designed a silicon nitride microring resonator structure that can generate squeezed light in a wide frequency band, but did not prepare entangled states

[0006] However, the silicon nitride microring resonator designed in the prior art cannot meet the phase matching conditions for multiple SFWMs at the same time, and no silicon nitride microring resonator has been directly used to simultaneously prepare multiple pairs of quantum entangled states.

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