A Novel Quantum State Transfer Method Based on Hamiltonian Learning

Abstract

The invention discloses a new quantum state transfer method based on Hamiltonian learning, which comprises the steps of preparing the input state by the sender and performing forward unitary evolution on it; the sender sends the input state after forward evolution to the Receiver; the receiver performs reverse unitary evolution of the received evolution quantum state and performs likelihood evaluation; the receiver uses Bayesian rule to update and resample the probability distribution of the measurement output data; the receiver updates and resamples according to As a result, it is judged whether the input state exists and is perfectly transferred to the receiver with probability 1 at a certain moment. The method of the present invention can be evaluated by the likelihood function and the mean square error, the likelihood function is the fidelity of the quantum state transfer, and the mean square error is the Bayesian loss, which is exponential with the measurement times of the interactive quantum likelihood evaluation experiment decline. Therefore, the method of the invention has the characteristics of strong confidentiality, high fidelity and small loss.

Description

technical field [0001] The invention belongs to the field of quantum communication, and in particular relates to a novel quantum state transfer method based on Hamiltonian learning. Background technique [0002] With the development of economy and technology, people's demand for information is increasing day by day, and information interaction has become inseparable from people's life. [0003] With the development of communication technology, there are a large number of phenomena in the process of information transmission, such as eavesdropping, interception, tampering and forgery. In order to reduce or avoid these situations, a reliable information transmission system needs to be established. The commonly used methods of information transmission include letters, telephones, computers, television, advertisements, etc. On the one hand, these transmission methods require information carriers such as text, language, electromagnetic waves or electrical signals; on the other h...

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Problems solved by technology

[0005] However, in practical applications, the Hamiltonian in a specific physical system is generally uncertain, and the specific form of the Hamiltonian needs to be determined through a large number of experiments; moreover, due to the existence of the coin operator, although the discrete-time quantum walk has More flexibility, the disadvantage is that if the degrees of the vertices in the graph are not all the same, local control of the coin is required

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