Free space hyper entangled noise resistant quantum communications using Lithium Niobate and calcite crystal components

Abstract

Using calcite crystals, or multi-stripe Lithium Niobate (LiNbO3) bulk crystal engineered / designed with dual periodic structures to facilitate concurrent Type-II quasi-phase-matching (QPM) spontaneous

Claims

Hyperentangled Design Claims:Claim 1A quantum communication system comprising:A source of hyperentangled photon pairs;Entanglement-preserving components configured to manipulate and transmit the hyperentangled photon pairs;Quantum communication modules utilizing hyperentanglement for applications such as quantum key distribution, teleportation, and secure communication;Claim 2The quantum communication system of claim 1, wherein the source of hyperentangled photon pairs comprises a nonlinear crystal-based spontaneous parametric down-conversion (SPDC) process.Claim 3A method for generating hyperentangled photon pairs, comprising:Initiating a nonlinear SPDC process.Exploiting the nonlinear process to generate photon pairs that are hyperentangled in multiple degrees of freedom, including polarization, frequency, and time.Utilizing spectral and temporal properties to ensure hyperentanglement ofthe photon pairs.Claim 4The method of claim 3, wherein the spectral and temporal properties are controlled by parametric down-conversion engineering in a nonlinear crystal.Claim 5A quantum communication method, comprising:Generating hyperentangled photon pairs.Utilizing the hyperentangled photon pairs for secure communication, quantum key distribution, teleportation, and cryptographic applications;Employing entanglement-preserving components to maintain and manipulate the hyperentanglement ofthe photon pairs.Calcite Crystal Detector Claims:Claim 6A quantum detection system comprising:A source of hyperentangled photon pairs;A calcite crystal configured to separate the hyperentangled photon pairs based on their polarization states;Polarization analysers or detectors for capturing the separated photons.Coincidence measurement apparatus for confirming entanglement correlations between the separated photons;Claim 7The quantum detection system of claim 6, wherein the calcite crystal is positioned to exploit its birefringent properties, causing the hyperentangled photons to split into distinct paths according to their polarization states.Claim 8A method for noise-resistant detection of hyperentangled photons, comprising: Generating hyperentangled photon pairs.Passing the hyperentangled photons through a calcite crystal to separate them based on their polarization states.Using polarization analysers or detectors to capture the separated photons.Performing coincidence measurements to confirm the entanglement correlations between the separated photons.Claim 9The method of claim 8, wherein the calcite crystal is oriented to ensure efficient separation of the hyperentangled photons according to their polarization states while preserving their entanglement properties.A quantum communication apparatus, comprising:A hyperentangled photon source.A calcite-based detection system configured to separate hyperentangled photons based on their polarization states, maintain entanglement correlations, and reduce noise impact;Quantum communication components utilizing the noise-resistant detection scheme to enable secure quantum key distribution, teleportation, cryptography, metrology, and communication network applications.

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