Remote quantum state preparation method based on quantum remote control

A remote control and remote quantum technology, applied in photon quantum communication and key distribution, can solve the problems of low efficiency and waste of resources, and achieve the effect of easy physical realization and high efficiency

Inactive Publication Date: 2019-01-22
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Now consider the problem: Suppose Alice, Bob, and Charlie are three legitimate participants in space separation
Although it is relatively straightforward, it wastes more resources, resulting in inefficiency

Method used

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  • Remote quantum state preparation method based on quantum remote control
  • Remote quantum state preparation method based on quantum remote control
  • Remote quantum state preparation method based on quantum remote control

Examples

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Embodiment Construction

[0046] Consider the following situation: There are three legitimate participants in the scheme, Alice, Bob, and Charlie. Suppose Bob wants to help his colleague Charlie prepare an arbitrary single quantum state:

[0047] |ξ> b =(x|0>+ye iθ |1>) b (1)

[0048] where |0> and |1> are two eigenstates of a single qubit, real coefficients x, y≥0, θ∈[0,2π), and x 2 +y 2 =1. Bob knows bits |ξ> b information, but Charlie does not know. At the same time, Alice intends to be in |ξ> b Execute a unitary operator U remotely.

[0049] To accomplish the above tasks, let Alice, Bob, and Charlie share a 3-bit GHZ state in advance:

[0050]

[0051] Among them, Alice, Bob, and Charlie own particles A, B, and C respectively. The specific steps of the protocol are as follows:

[0052] Step 1: Bob first introduces an initial state |0> B′ Auxiliary particle B', then performs a CONT on bits B and B' BB′ , where CONT XY is a controlled NOT gate acting on the two qubits X and Y, satis...

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Abstract

The invention provides a method for simultaneously realizing remote state preparation and quantum remote control. The remote quantum state preparation method based on quantum remote control utilizes the quantum nonlocality of a three-particle GHZ state to simultaneously perform the remote preparation of an arbitrary single-particle state and realize the remote rotation on the particle state. The invention has the advantages that: the invention is based on sharing a three-particle GHZ state to complete the scheme of preparing arbitrary single-particle quantum state and loading rotation control;compared with the intuitive solution, the protocol of the invention has higher efficiency; only Pauli operator, controlled NOT gate, Bell state measurement, single particle measurement, EPR state, GHZ state and the like are use in the scheme of the invention, which is easy to be physically realized.

Description

technical field [0001] The invention relates to a remote quantum state preparation method based on quantum remote control. Background technique [0002] In the past few decades, the application of quantum mechanics in the fields of computer science and information theory has greatly promoted the emergence of interdisciplinary science, including quantum informatics, quantum communication, quantum computing, etc., among which quantum teleportation is one of the ingenious applications of quantum informatics . In the quantum teleportation scheme proposed by Bennett et al. for the first time in 1993, an EPR pair is used as a quantum channel and combined with Bell measurement and classical communication to transmit an unknown quantum state. Another class of well-recognized versions of quantum transport protocols are remote state preparation schemes (RSP) and joint remote state preparation schemes (JRSP). In RSP, only one sender knows the complete information of the prepared stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852
Inventor 彭家寅柏明强莫智文张长悦
Owner SICHUAN NORMAL UNIVERSITY
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