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Memory system using quantum convolutional code

A quantum and qubit technology, applied in the field of quantum computing, can solve problems such as high-fidelity loss rate or degradation rate, and achieve the effect of improving reliability and slowing down the effective degradation rate

Pending Publication Date: 2020-11-17
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, quantum states or populations of quantum states may exhibit relatively high rates of fidelity loss or degradation, for example, due to decoherence in quantum gate devices, processing, and / or transmission through quantum channels

Method used

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  • Memory system using quantum convolutional code
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  • Memory system using quantum convolutional code

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Embodiment Construction

[0012] Some embodiments may benefit from at least some of the features disclosed in U.S. Patent Nos. 8,324,120, 8,633,092, 8,987,703, 9,286,154, 9,762,262, and 9,944,520, all of which are incorporated by reference in their entirety incorporated into this article.

[0013] Traditional convolutional codes generate error-correcting codes for encoded symbols via sliding application of a Boolean polynomial function to a data stream. The sliding application denotes the "convolution" of the encoder on the data, which is reflected in the code name (ie, "convolutional code"). The sliding nature of convolutional codes facilitates trellis decoding, where the corresponding trellis is time-invariant. The time-invariant trellis allows decoding of convolutional codes using maximum-likelihood soft-decision decoding implemented with practical circuits of tractable complexity.

[0014] In contrast, block error correction codes are usually represented by a time-varying trellis and thus, are us...

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Abstract

The invention relates to a memory system comprising a qubit array configured to store therein one or more entangled qubit states encoded using a quantum stabilizer code. The memory system further comprises a quantum-state-refresh module configured to refresh an entangled qubit state in the qubit array when a degradation error is detected therein. The quantum-state-refresh module is further configured to detect the degradation error by performing a redundant measurement of a set of syndrome values corresponding to the quantum stabilizer code. The redundant measurement is based on an error-correction code defined using the generator matrix of the quantum stabilizer code and a corresponding supplemental parity-check matrix. In an example embodiment, each of the generator and supplemental parity-check matrices has a respective inclined-stripe form.

Description

technical field [0001] Various example embodiments relate to quantum computing and more particularly, but not exclusively, to memory systems for quantum computing devices. Background technique [0002] This section introduces aspects that may help to facilitate a better understanding of the invention. Accordingly, the statements in this section are read in this light and should not be construed as admissions as to what is or is not in the prior art. [0003] Quantum computing devices have been fabricated or proposed based on various technologies, such as superconducting junction devices, ion trap devices, quantum well devices, fractional quantum Hall effect (FQHE) devices, and the like. Quantum computing devices typically use quantum memory to store state, and hardware to write state to and read state from memory. Reliable methods for writing to and reading from quantum memory can be used in various types of quantum computing devices. Some quantum computing applications r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/23G06N10/00
CPCH03M13/235G06N10/70H03M13/1148H03M13/23H03M13/611B82Y10/00G06F7/78
Inventor 阿列克谢·阿西赫明
Owner NOKIA TECH OY