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A kind of oam photon state separator

A splitter and photon technology, applied in the field of information processing, can solve the problems of destroying the quantum state, affecting the interference visibility, OAM photon state separation efficiency and purity decline, and achieving the effect of simplifying the structure of the device

Active Publication Date: 2018-11-27
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Scheme 1 can only separate a specific quantum state and realize the measurement (the improved scheme can separate multiple quantum states, but it is still far from meeting the needs), and the efficiency of separation and measurement is very low
Although scheme 2 can efficiently separate 20-30 different quantum states at the same time, the separation measurement process of schemes 1 and 2 needs to convert the OAM photon state into Gaussian light or plane light, which destroys the original quantum state, so the separation The resulting photonic state cannot be used for further quantum operations
These shortcomings severely limit the application of OAM photonic states in quantum information processing
Scheme 3 can achieve the non-destructive separation of OAM photon states, but this scheme can only separate the OAM photon states of odd and even orders. If you want to achieve the separation of different even-order (odd-order) quantum states, you need to cascade MZI structure, and VPP needs to be added between the cascaded structures to change the order of the OAM photon state
Due to the existence of the Gouy phase factor, the added VPP will cause the phases of different orders of OAM photon states to change, thereby affecting the interference visibility. With the increase of the order of OAM photon states and the number of cascaded MZIs, the separation efficiency and purity of OAM photon states will keep falling

Method used

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  • A kind of oam photon state separator
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  • A kind of oam photon state separator

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Embodiment approach 1

[0054] This embodiment provides a parallel cascaded structure (PCS) OAM photon state separator, the structure is as follows Figure 5 shown in place of image 3 The OAM photonic state separator of the same dimensionality shown.

[0055] Its specific implementation structure is to cascade p q-dimensional OAM photon state separators in parallel after a p-dimensional OAM photon state separator, such as Figure 5 As shown, each output port of the p-dimensional OAM photon state separator is cascaded with a q-dimensional OAM photon state separator. This structure can simultaneously separate [p, q]-dimensional OAM photon states, where [p, q] represents the least common multiple of p and q.

[0056] If p and q are relatively prime, the number of new 4-channel beam splitters (BS) required for this cascade structure for separating N-dimensional OAM photon states And directly use an OAM photon state separator of the same dimension (such as figure 2 shown) the number of new 4-channel...

Embodiment approach 2

[0058] The present invention proposes a parallel multi-stage cascade structure (PMCS) OAM photon state separator, the structure is as Figure 6 shown. The PMCS-OAM photonic state separator includes 1 p 1 dimensional OAM photonic state separator as the first stage, p 1 p 2 dimensional OAM photonic state separator as the second stage, p 1 ·p 2 p 3 dimensional OAM photonic state separator as level 3, ..., p 1 ·p 2 ·…·p j-1 p j dimensional OAM photon state separator as the jth stage, where p 1 ,p 2 ,...,p k Pairwise coprime, each p in the i-th level i Dimensional OAM photon state separator and the corresponding p in the i+1th stage i p i+1 For the connection mode of the dimensional OAM photon state separator, refer to the connection mode in Embodiment 1, where i=1, 2, . . . , j−1, j is a positive integer. The separator of this structure can simultaneously separate p 1 ·p 2 ·…·p j Dimensional OAM photon states. When realizing the separation of OAM photon states w...

Embodiment approach 3

[0060] The present invention proposes a time delay cascade structure (TDCS) OAM photon state separator, the structure is as Figure 7 shown. The separator of this structure includes a p-dimensional OAM photon state separator and a q-dimensional OAM photon state separator, and p time delay devices TD, where p and q are mutually prime, and each output of the p-dimensional OAM photon state separator The port is cascaded with the q-dimensional OAM photon state separator and an incident port through a time delay device, which reduces the number of q-dimensional OAM photon state separators in the first embodiment in a time-sharing manner. where p > q.

[0061] For the separation of N-dimensional OAM photon states, the required number of BSs for this structure satisfies The resources are further saved, and the practicability and dimension scalability of the OAM photon state separator are enhanced.

[0062] TDCS-OAM photonic state separator is not limited to Figure 5 The two-level...

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Abstract

The invention discloses an OAM photon state separator. The OAM photon state separator comprises a first N-dimensional multichannel beam splitter which comprises N incident ports and N emitting ports; a second N-dimensional multichannel beam splitter which comprises N incident ports and N emitting ports; and N SAM-maintaining Dove prism modules, wherein the k-th SAM-maintaining Dove prism module is arranged between the k-th incident port of the first N-dimensional multichannel beam splitter and the k-th incident port of the second N-dimensional multichannel beam splitter, N is a positive integer, N is greater than or equal to 2, k is equal to 1, 2,...,N, and the first N-dimensional multichannel beam splitter and the second N-dimensional multichannel beam splitter can realize N-dimensional unitary transformation.

Description

technical field [0001] The present invention relates to the technical field of information processing, in particular to an OAM photon state separator. Background technique [0002] The dimension of the Hilbert space of the orbital angular momentum (OAM) photon state can be infinite in principle, therefore, the OAM photon state plays an important role in high-dimensional quantum information processing. As a high-dimensional quantum state, the OAM photon entangled state realizes the verification of high-dimensional Bell’s inequality, and plays an important and unique role in quantum precision measurement; as the carrier of high-dimensional qubits, OAM photon state is the main component of high-dimensional quantum communication. One of the candidates; as a carrier of orbital angular momentum, OAM photon states have important applications in optomechanical research, such as optical tweezers. [0003] The basic premise of using OAM photon states in the above fields is: 1. Prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70G02B27/10
CPCG02B27/10H04B10/70
Inventor 陈巍王纺翔银振强王双周政何德勇韩正甫郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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