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Cluster state-based quantum state preparation method

A quantum state and cluster state technology, applied in the quantum field, can solve the problems that do not take into account the characteristics of quantum state information, and achieve the effects of fewer entangled particles, improved preparation efficiency, and strong feasibility

Inactive Publication Date: 2018-11-06
GUANGXI UNIV FOR NATITIES
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Problems solved by technology

However, as far as the current research is concerned, most of the remote quantum state preparation schemes use the receiver to transform the quantum state, and the remote quantum state preparation method based on the evolution of the sender is rarely reported.
The main reason is that it does not take into account the characteristics that the sender needs to prepare quantum state information in the remote quantum state preparation, and establish an efficient quantum state preparation scheme based on this characteristic

Method used

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with embodiment. When the formula quantities in the present invention are not described one by one, the meanings and meanings represented by the same quantities as those in other formulas are the same. Among them, the formula parameters or labels that have not been explained one by one in the company belong to the common knowledge in the quantum field, and the applicant believes that there is no need to explain them one by one.

[0048] A method for preparing quantum states based on cluster states, such as figure 1 As shown, there are 3 participants in the method, including two senders and a receiver, and the two senders cooperate to help the receiver prepare quantum states on his quantum system

[0049]

[0050] real number α 00 ,α 01 ,α 10 ,α 11 ,λ 01 ,λ 10 ,λ 11 Satisfy the normalization relationship. In order to improve the security of quantum state preparation, all quantum state inform...

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Abstract

The invention provides a cluster-based quantum state preparation method, belongs to the field of quanta, and uses a six-particle entangled cluster state as a quantum entanglement channel through all communication parties. By introducing additional particles, a sender executes a joint unitary evolution method to repeatedly evolve entangled information till the channel is successfully evolved into atarget channel. After the channel is successfully evolved, the sender performs X-based measurement or two-particle orthogonal projection measurement on the entangled particles, and publishes measurement results. A receiver chooses to execute the corresponding unitary operation, and can complete remote preparation of an arbitrary double-quantum state. The method provided by the invention utilizesthe X-based measurement and two-particle orthogonal projection measurement to solve the problem of remote joint preparation of a quantum state based on a six-particle entangled cluster state. By introduction of the additional particles and repeated evolution of the entanglement channel, the efficiency of remote quantum state preparation is improved. The cluster-based quantum state preparation method has the advantages of the number of entanglement particles needing to be dispensed is small and the feasibility is high.

Description

technical field [0001] The invention relates to the quantum field, in particular to a method for preparing a quantum state based on a cluster state. Background technique [0002] Long-range quantum state preparation needs to be based on pre-shared maximum entangled state non-local correlation. However, the preparation efficiency of the GHZ state in the multi-particle maximum entanglement state is not high. In addition, due to equipment defects and channel noise, the maximum entanglement channel often evolves into a non-maximum entanglement channel when the entangled particles are distributed in the remote quantum state preparation. There are currently three methods to eliminate the influence of non-maximally entangled channels on long-range quantum state preparation. The first method is to use entanglement concentration or purification technology to convert the non-maximally entangled channel into a maximally entangled channel; the second is to introduce additional particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N99/00
Inventor 周萍
Owner GUANGXI UNIV FOR NATITIES
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