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Preparation method of long-distance remote quantum state based on ghz state and bell state

A long-distance quantum and long-distance technology, which is applied in the field of long-distance remote quantum state preparation based on GHZ state and Bell state, can solve the problems of distance limitation, inability to form entangled channels, increased photon loss, etc., and achieve the effect of improving efficiency

Active Publication Date: 2021-11-19
SUZHOU UNIV
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  • Application Information

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Problems solved by technology

For photonic quantum communication, the distance is greatly limited due to the decoherence coupled with the environment and the increased loss of photons in the quantum channel, which also leads to an exponential decay of quantum information fidelity. In the case of long-distance remote quantum communication, many An effective entanglement channel cannot be formed between remote nodes due to the distance

Method used

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  • Preparation method of long-distance remote quantum state based on ghz state and bell state
  • Preparation method of long-distance remote quantum state based on ghz state and bell state
  • Preparation method of long-distance remote quantum state based on ghz state and bell state

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preparation example Construction

[0104] refer to figure 1 As shown, the present invention provides a kind of long-distance remote quantum state preparation method based on GHZ state and Bell state, comprising the following steps:

[0105] Step 1: The entanglement channel resources required by the present invention are composed of the GHZ channel of the local node and the Bell chains in the three directions of A, B, and C. The local node A 1 , B 1 、C 1 particle of Sharing the maximum entangled GHZ state, the channel form is as follows:

[0106]

[0107] The composition of the Bell chain in the A direction is as follows: Node A k with node A k+1 Shared Bell pair Node A k have particles Where k=1...n-1, in particular, remote node A n only have particles Then the form of the Bell chain in the A direction is:

[0108]

[0109] At the same time, the composition of the Bell chain in the B and C directions is the same as that of the Bell chain in the A direction, and the node B k with node B k+...

Embodiment 1

[0220] The long-distance remote quantum state preparation method based on the GHZ state and the Bell state, taking the Bell chain in the A direction with three nodes as an example, node C is 1 To prepare any single particle state, the specific steps are:

[0221] Step 1: The entanglement channel resources required by the present invention are composed of the GHZ channel of the local node and the Bell chain in the A direction, and the local node A 1 , B 1 、C 1 particle of Sharing the maximum entangled GHZ state, the channel form is as follows:

[0222]

[0223] The composition of the Bell chain in the A direction is as follows: Node A 1 with node A 2 Shared Bell pair Node A 2 with node A 3 Shared Bell pair Node A 1 have particles remote node A 2 only have particles Then the form of the Bell chain in the A direction is:

[0224]

[0225] Then the system form can be written as:

[0226]

[0227] The form of the target state is as follows:

[0228] ...

Embodiment 2

[0293] The long-distance remote quantum state preparation method based on the GHZ state and the Bell state, taking the Bell chain with two nodes in each direction of A, B, and C as an example, node C is 2 To prepare any single particle state, the specific steps are:

[0294] Step 1: The entanglement channel resources required by the present invention are composed of the GHZ channel of the local node and the Bell chains in the three directions of A, B, and C. The local node A 1 、B 1 、C 1 particle of Sharing the maximum entangled GHZ state, the channel form is as follows:

[0295]

[0296] A, B, C three direction Bell chain form is as follows: Node A 1 with node A 2 Shared Bell pair Node B 1 with node B 2 Shared Bell pair Node C 1 with node C 2 Shared Bell pair Node A 1 have particles Node B 1 have particles Node C 1 have particles In particular, remote node A 2 、B 2 、C 2 only have particles Then the form of the Bell chain in the three directions...

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Abstract

The invention discloses a method for preparing a long-distance remote quantum state based on GHZ state and Bell state, comprising the following steps: constructing quantum entanglement channel resources; performing measurement operations on the Bell chains in each direction at the same time, and performing measurement operations according to the results of the measurement operations The remote nodes perform the corresponding unitary operation to obtain the state distribution of the particles at the remote nodes; measure the amplitude and phase of the particles at the two remote nodes respectively, and inform other remote nodes of the measurement results, and other remote nodes The nodes perform unitary operations according to the measurement results to obtain the target state. With the help of the GHZ channel of the local node and the Bell chain between the intermediate nodes, it overcomes the limitation of the long-distance quantum state preparation, and the remote node finally forms the quantum channel required for the state preparation, thereby realizing the target node C n Arbitrary state preparation of single particles.

Description

technical field [0001] The invention relates to the technical field of communication network and information dissemination, in particular to a long-distance remote quantum state preparation method based on GHZ state and Bell state. Background technique [0002] Quantum information and communication play a vital role in modern communication technologies. Quantum informatics is an interdisciplinary subject between classical information theory and quantum mechanics, and its research fields mainly include quantum computing and quantum communication. Quantum communication is a new type of communication method that uses quantum entanglement effect to transmit information, and the main body of information it transmits is quantum information or classical information. The main schemes of quantum communication include quantum teleportation, quantum remote state preparation, quantum key sharing, etc. [0003] In contrast to quantum teleportation, quantum remote state preparation sche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70H04L9/08
CPCH04B10/70H04L9/0852H04L9/0855
Inventor 许智航江聪姜敏丁祎龚仁智陈虹赵文浩
Owner SUZHOU UNIV
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