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Preparation device capable of purifying entangled state in any dimension and preparation method

A technology for preparing devices and entangled states, applied in the field of quantum information processing

Active Publication Date: 2020-11-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no device capable of producing purifiable entangled states in any dimension

Method used

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  • Preparation device capable of purifying entangled state in any dimension and preparation method
  • Preparation device capable of purifying entangled state in any dimension and preparation method
  • Preparation device capable of purifying entangled state in any dimension and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A preparation device for two-dimensional purifiable entangled states, such as figure 1 As shown, it includes laser, nonlinear optical crystal 1, first half-wave plate 13, second half-wave plate 14, first 66:33 beam splitter 2, second 66:33 beam splitter 3, first BS4, The second BS5, the first PBS6, the second PBS7, the first attenuator 10, the second attenuator 11, the third attenuator 12, the first reflector 8, the second reflector 9, the first BD15,

[0071] In this embodiment, the nonlinear optical crystal 1 is a BBO crystal.

[0072] The light output by the laser is respectively input to the A light path and the B light path through the nonlinear optical crystal 1;

[0073] The first BD15 is set in the B optical path to generate 2 optical branches; on the B optical path, the light passes through the first BD15, and the optical path is divided into 0 optical branch and 1 optical branch; on the 0 optical branch and 1 optical branch A third half-wave plate 17 and a f...

Embodiment 2

[0080] A preparation device for three-dimensional purifiable entangled states, such as figure 2 As shown, the difference from the two-dimensional purifiable entangled state preparation device provided in Example 1 is that the device includes four BDs.

[0081] In the B optical path, the first BD15 and the second BD16 are sequentially arranged along the optical path, which are divided into 2 and 3 optical branches in turn, and a half-wave plate is arranged on each of the optical branches, that is, between the first BD15 and the second BD16. The third half-wave plate 17 and the fourth half-wave plate 18 are respectively arranged on the two optical branches of the second BD16; the fifth half-wave plate 19, the sixth half-wave plate 20 and the third half-wave plate 19 are successively arranged on the three optical branches output by the second BD16. Seven half-wave plates 21.

[0082] The first 66:33 beam splitter 2 is set in the A optical path, and the optical path is divided i...

Embodiment 3

[0086] A four-dimensional purifiable entangled state preparation device differs from the two-dimensional purifiable entangled state preparation device provided in Example 1 in that the device includes 6 BDs.

[0087] Such as Figure 4 As shown, in the optical path B, the first BD15, the second BD16, and the third BD22 are sequentially arranged along the optical path, which are divided into 2, 3, and 4 optical branches in turn, and each optical branch is provided with a half-wave plate , that is, the third half-wave plate 17 and the fourth half-wave plate 18 are respectively arranged on the two optical branches between the first BD15 and the second BD16, and the three optical branches between the second BD16 and the third BD22 are respectively arranged The fifth half-wave plate 19, the sixth half-wave plate 20 and the seventh half-wave plate 21; the eighth half-wave plate 23, the ninth half-wave plate 24, the tenth half-wave plate 25 and eleventh half-wave plate 26;

[0088] ...

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Abstract

The invention relates to a preparation device capable of purifying an entangled state in any dimension, and a preparation method, and in the device, light outputted by a laser isinputted to an A optical path and a B optical path through a nonlinear optical crystal; in the B light path, d-1 BDs are sequentially arranged along the light path, and finally d light branches are generated; in the lightpath A, the light passes through a first 66: 33 beam splitter and is divided into a reflection light path t and a transmission light path r, the light on the reflection light path t and the light on the transmission light path r are converged at a second 66: 33 beam splitter, and the output light of the second 66: 33 beam splitter sequentially passes through d-1 BDs to generate d light branches, so that a d-dimensional purifiable entangled state is prepared. The prepared purifiable entangled state is high in fidelity, the fidelity of the prepared two-dimensional purifiable entangled state is about 0.98, and the fidelity of the prepared three-dimensional purifiable entangled state is about 0.96.

Description

technical field [0001] The invention relates to a preparation device and a preparation method for purifying an entangled state in any dimension, belonging to the field of quantum information processing. Background technique [0002] Two-body Mixed State ρ of Arbitrary Dimensions AB , transpose the particle B to obtain a positive semi-definite operator, then this ρ AB is defined as the PPT state, otherwise ρ AB It is an entangled NPT state (negative-partial-transpose). So the NPT state satisfies: is a two-parameter two-body mixture. [0003] The standard form of this NPT state is as follows: [0004] [0005] in, [0006] Normalization conditions: a, b, and c are the coefficients of the three states, respectively, and d is the dimension of the NPT state. [0007] Any form of NPT state can be transformed into a standard ρ through local quantum operations and classical communication bc form. The PPT state is composed of a separable state and an entangled state ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
CPCG02F1/3501
Inventor 逯鹤房晓旭
Owner SHANDONG UNIV
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