Method for estimating multi-degree-of-freedom stealth state transmission efficiency under quantum noise

Abstract

The invention discloses a method for estimating multi-degree-of-freedom stealth state transmission efficiency under quantum noise. The method comprises the following specific steps: interfering noiseinto a communication process, describing noise generation operators of different types of noise, constructing a polarization space hyper-entangled quantum stealth transfer state, constructing a quantum noise model, calculating quantum fidelity under the noise, and measuring quantum stealth transfer state efficiency by utilizing average fidelity. According to the invention, a superoperator summation method is used; four kinds of common quantum noise are superposed to act on quantum bits; a noise model is established by considering the influence of noise on three different photons in the quantumstealth transfer process; due to the fact that space entanglement is not easily affected by noise, the quantum in the default space freedom degree is in the maximum entanglement state, the situationthat polarization entanglement is affected by noise is mainly considered, the average fidelity is redefined, and according to the specific situation, the proper quantum state is selected to ensure that quantum stealth transfer achieves the optimal efficiency.

Description

technical field [0001] The invention relates to the field of quantum teleportation, in particular to a method for estimating transmission efficiency of multi-degree-of-freedom teleportation under quantum noise. Background technique [0002] Since Austrian scientists first successfully realized quantum teleportation based on entanglement in 1997, quantum teleportation has been realized in many physical systems including cold atoms, ion traps, and superconductivity. Early research on quantum teleportation The research is carried out in an ideal environment. The entanglement resources are the largest entangled states in the quantum system, and the perfect quantum teleportation is completed for the input state, that is, the input state is exactly the same as the output state, and the fidelity reaches the maximum value of 1. However, in the actual quantum teleportation process, the quantum system cannot be completely isolated from the external environment, and will be affected by...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in this method. This method only studies quantum teleportation on a single degree of freedom, and has not been extended to single-photon multi-degrees of freedom. There are certain limitations.

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