GHZ-state-based joint remote M-bit W state preparation method

A remote preparation and bit technology, applied in the field of quantum communication, can solve problems such as difficult implementation, multi-bit W states have not been widely studied, and a large number of quantum channel resources.

Active Publication Date: 2018-09-14
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, in quantum information processing, although there have been many schemes for remotely preparing four-bit W states, how to remotely prepare multi-bit W states has not been

Method used

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  • GHZ-state-based joint remote M-bit W state preparation method
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  • GHZ-state-based joint remote M-bit W state preparation method

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Experimental program
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Effect test

Embodiment 1

[0060] Such as figure 1 , provides a method for joint remote preparation of M-bit W states based on GHZ states. The form of any four-bit W states to be prepared is:

[0061]

[0062] The specific steps for the joint remote preparation of the four-bit W state include:

[0063] Step 1: The sender Alice first preprocesses the quantum communication channel according to the amplitude information of the W state to realize amplitude modulation.

[0064] A quantum communication channel and a classical communication channel are established between the sender Alice and another sender Bob and the receiver Charlie. Among them, two senders Alice, another sender Bob and a receiver Charlie share two GHZ quantum entangled states:

[0065]

[0066] Among them, the parameter α 1 ,α 2 ,β 1 ,β 2 is a real number, b 0 = α 1 alpha 2 ,b 1 = α 1 beta 1 ,b 2 = α 2 beta 1 ,b 3 = α 2 beta 2 To meet the conditions Particle A 1 ,A 2 Belonging to the sender Alice, Particle B 1 ...

Embodiment 2

[0101] Such as figure 2 As shown, a method for joint remote preparation of a five-bit W state based on the GHZ state is provided. The form of any five-bit W state to be prepared is:

[0102]

[0103] The specific steps for the joint remote preparation of the five-bit W state include:

[0104] Step 1: The sender Alice first preprocesses the quantum communication channel according to the amplitude information of the W state to realize amplitude modulation.

[0105] A quantum communication channel and a classical communication channel are established between the sender Alice and another sender Bob and the receiver Charlie. Among them, two senders Alice, another sender Bob, and a receiver Charlie share three GHZ quantum entangled states:

[0106]

[0107] Among them, the parameter α 1 ,α 2 ,α 3 ,β 1 ,β 2 ,β 3 is a real number, b 0 = α 1 alpha 2 alpha 3 ,b 1 = α 1 beta 2 alpha 3 ,b 2 = β 1 alpha 2 alpha 3 ,b 3 = β 1 beta 2 alpha 3 ,b 4 = α 1 alpha ...

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Abstract

The invention relates to a GHZ-state-based joint remote M-bit W state preparation method, which is designed to utilize least quantum channel resources. The method comprises the following steps that: two senders, namely, Alice and Bob as well as one receiver, namely, Charlie remotely prepare an M-bit W state, the three parties only need to share [log<2>M] GHZ channels, and the sender, namely, Alicepreprocesses a quantum communication channel according to amplitude information of the W state; the two senders, namely, Alice and Bob respectively construct corresponding measurement bases accordingto partial phase information of the W state to be prepared, measure own particles, and send measurement results to the receiver, namely, Charlie; the receiver, namely, Charlie performs a unitary operation on owned particles according to the measurement results of the two senders, namely, Alice and Bob to obtain an intermediate quantum state corresponding to a target W state; and the receiver, namely, Charlie introduces auxiliary particles, performs a corresponding substitution operation, and recovers a target M-bit W state. Through adoption of the method, information leakage can be avoided, and the consumption of quantum resources is reduced effectively.

Description

technical field [0001] The invention belongs to the field of quantum communication, and more specifically, the invention relates to a method for efficiently jointly and remotely preparing multi-bit W states. Background technique [0002] Quantum communication refers to a new type of communication method that uses quantum entanglement effect to transmit information, and it is a new interdisciplinary subject developed in the past two decades. In quantum information science, entangled states play a key role in various fields of quantum information. Due to the special physical properties of entangled states, quantum information has many new features that classical information does not have. At the same time, entangled states also provide new physical resources for information transmission and information processing. The two-particle entangled state is the simplest state in the quantum entangled state, and people's research on it is relatively mature. However, due to the divers...

Claims

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Application Information

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IPC IPC(8): H04B10/70
CPCH04B10/70
Inventor 姜敏吴娜娜李青黄旭周刘蕾
Owner SUZHOU UNIV
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