Bell state conversion method, conversion system and application

A conversion method and conversion system technology, which is applied in the field of Bell state conversion method and conversion system, can solve the problems that cannot meet the requirements of stability, high speed, high efficiency and security of quantum computing and quantum communication, cannot achieve equivalent operations, and are not easy to combine Operation and other issues, to achieve the effect of flexible local operation, ensuring stability, and stable and compact structure

Active Publication Date: 2018-09-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it needs to post-select the converted state, the operation is complicated and the efficiency is greatly reduced, and it is not easy to perform combined operations
[0005] Alternatively, perform equivalent operations randomly (such as δ z and -δ z ) can guarantee the security of certain quantum communications [Han, Yun-Guang, et al. "Security of modified Ping-Pong protocol in noisy and lossy channel. "Scientific reports 4, 4936 (2014).], however, the Bell state Conversion methods do not implement such equivalent operations
[0006] In short, the existing Bell state conversion methods can no longer meet the requirements of stability, high speed, high efficiency and security in quantum computing and quantum communication.

Method used

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  • Bell state conversion method, conversion system and application
  • Bell state conversion method, conversion system and application
  • Bell state conversion method, conversion system and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]

[0045] In Embodiment 1, the propagation channel of photons is free space.

[0046] In embodiment 1, photon 1a enters a Sagnac ring, and this ring comprises: polarization beam splitter 2, reflector 3, phase modulator 4, reflector 5, half-wave plate 6; Photon 1b then directly transmits ( figure 1 Shown in is that photon 1a enters the Sagnac ring, and photon 1b is directly transmitted, and the same operation can also be that photon 1a is directly transmitted, and photon 1b enters the Sagnac ring).

[0047] In embodiment 1, the spatial coordinate system of the photon 1a is consistent with the polarization beam splitter 2, the horizontal and vertical polarizations of the photon are respectively transmitted and reflected by the polarization beam splitter 2, and the transmitted polarization moves clockwise in the Sagnac ring direction, while the reflected polarization propagates counterclockwise in the Sagnac ring.

[0048] In Example 1, the horizontal polarization propa...

Embodiment 2

[0054]

[0055] In Embodiment 2, the propagation channel of photons is an optical fiber.

[0056] In embodiment 2, photon 7a shoots into a Sagnac ring, and this ring comprises: polarization beam splitter 8, 90 ° Faraday rotator plate 9, optical fiber delay line 10, phase modulator 11, preferably all devices in this Sagnac ring are protected polarized fiber connection; Photon 7b is directly transmitted ( figure 2 Shown in is that photon 7a enters the Sagnac ring, and photon 7b is directly transmitted, and the same operation can also be that photon 7a is directly transmitted, and photon 7b enters the Sagnac ring).

[0057] In Embodiment 2, the spatial coordinate system of the photon 7a is consistent with the polarization beam splitter 8, and the horizontal and vertical polarizations of the photon are transmitted and reflected when passing through the polarization beam splitter 8, respectively. The transmitted horizontal polarization propagates clockwise in the Sagnac ring, ...

Embodiment 3

[0065]

[0066] In Embodiment 3, the propagation channel of photons is an optical fiber.

[0067] In Embodiment 3, the phase modulator 13 is a dual-polarization electro-optic phase modulator, and the Faraday rotating mirror is a 45° rotating mirror.

[0068] In Embodiment 3, the eigenstate S of the photon 12a first passes through the phase modulator 13, and then is reflected by the Faraday rotating mirror 14 and passes through the phase modulator 13 again. When the eigenstate S passes through the phase modulator 13 twice, the The phasing voltage of the phasor is the same. The Faraday rotating mirror 14 ensures that the phase modulation is polarization independent.

[0069] In embodiment 3, after the eigenstate S of the photon 12a passes through the phase modulator 13 for the second time, then the eigenstate L of the photon 12a passes through the phase modulator 14 for the first time, and then is reflected by the Faraday rotating mirror 14 and passes through again The phas...

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Abstract

The invention discloses a transformation method for Bell states. The method comprises the step of applying different phases to two eigenstates of any one of two quantum bits in the Bell states by phasing in different times. And a transformation system for the Bell states and the application of the transformation method in the field of quanta are provided. According to the method, through the design of applying the corresponding phases to the two eigenstates of the quantum bits in different times, the local operation of the Bell state transformation is flexible and variable, the security of some quantum communication (such as deterministic quantum key distribution) can be enhanced, and in addition, the design can be conveniently integrated into the local operation of various Bell states.

Description

technical field [0001] The invention belongs to the technical field of quantum information, specifically relates to a Bell state conversion method and conversion system, and is suitable for application fields such as quantum precision measurement, quantum communication, and quantum calculation. Background technique [0002] [0003] δ of polarization entanglement z Operation as an example, the current common implementation method is to use a phase modulator or a fractional wave plate (1 / 2 or 1 / 4 wave plate), directly between the eigenstate horizontal polarization |H> and vertical polarization |V> A phase difference π is introduced [M. Ostermeyer et al, Optics Communications, 281, 4540 (2008); K. Mattle et al, Phys. Rev. Lett. 76, 4656 (1996)]. The disadvantage of the phase modulator method is that the modulation effect and insertion loss of the phase modulator are polarization-dependent, and it is difficult to achieve complete symmetry for the two polarization stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70H04B10/532H04B10/556
CPCH04B10/532H04B10/5561H04B10/70
Inventor 王双陈华陈巍银振强周政韩正甫郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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