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Journal of Nanjing University of Posts and Telecommunications

A Construction of Quantum Low-Density-Parity Code Based on Sparse Sequences

Baoyu Zheng

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

CSS code is a simple,efficient quantum error correction code construction,and has been found applications in construction of varieties of quantum codes,so far.In this paper,we propose a new construction method of quantum parity check matrix codes based on CSS by taking advantage of the method used in classical quasi-cyclic LDPC codes.Using quick encoding algorithm,we can obtain the quantum code based on this proposed method.At last,a quantum code(3,8)(16,6) is selected as the example to illustrate the process of construction,and its encoding circuit by Controlled-not gate and Hadard gate is also presented.

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Based on the lines and points in finite geometry,a method to construct the low density parity check codes is discussed in this paper.According to the characteristics of these codes,the dual codes of this kind of LDPC codes are obtained by splitting the rows or columns of the check matrix.A novel construction method of quantum low-density-parity-check code is developed according to the theory of quantum CSS codes.Quantum code(15,4) is selected as an example to illustrate the availability of this construction method,and its performance is analyzed under the bit-flipping channel.It is shown that this method is easier to construct the dual codes,and the performance of quantum codes constructed is superior to that of classical ones.

Journal of Nanjing University of Posts and Telecommunications•Jan 1, 2008•0 citations
CSS code is a simple,efficient quantum error correction code construction,and has been found applications in construction of varieties of quantum codes,so far.In this paper,we propose a new construction method of quantum parity check matrix codes based on CSS by taking advantage of the method used in classical quasi-cyclic LDPC codes.Using quick encoding algorithm,we can obtain the quantum code based on this proposed method.At last,a quantum code(3,8)(16,6) is selected as the example to illustrate the process of construction,and its encoding circuit by Controlled-not gate and Hadard gate is also presented.
In this paper, a construction method of quantum low density parity check codes (quantum LDPC) which based on classical quasi-cyclic sparse sequence is proposed, and the quantum code QLDPC(3,8)(16,6) and QLDPC(3,8)(64,24) are selected as examples to illustrate this construction method. The performances of this kind quantum LDPC codes are discussed over the bit-flipping channel by numerical simulations. The results show that these quantum codes have good ability to correct error in quantum channel.
Quantum error correction is the basic technique for realization of quantum communication and quantum computation. So far, the theories of quantum error correction have become more and more perfect, and many counterpart of classical error correction coding technique have been found in quantum area. In this article, we proposed a new method of construction of parity check matrix of quantum low density parity check (LDPC) codes which based on classical quasi-cyclic LDPC codes, and selected the quantum code (3,8)(16,6) as the example to illustrate the construction of quantum code. We also gave its completing circuit by controlled-not gate and Hadamard gate.
Quantum error correction codes are needed to protect quantum systems from interference. An important family of quantum error correction codes are stabilizer codes. Many stabilizer codes in the literature belong to a subclass of stabilizer codes, referred to as CSS codes since they are based on the so-called CSS formalism. CSS codes have received significant attention because the dual-containing condition for the CSS formalism is relatively straightforward to satisfy and also because it is easy to produce CSS codes from classical error correction codes. However, some stabilizer codes in the literature show superior error correction performance than existing CSS codes, and are based on binary low-density parity-check (LDPC) codes. Since it has been shown that CSS codes based on nonbinary LDPC codes have good performance over quantum qubit channels, in this paper we investigate stabilizer codes based on nonbinary LDPC codes. In particular, we propose constructions of stabilizer codes based on nonbinary quasi-cyclic low-density parity-check (QC-LDPC) codes for qubit channels. The simulation results show that our QC-LDPC stabilizer codes decoded by a nonbinary sum-product algorithm have better performance than their binary counterparts.
Quantum error correction is the basic technique for realization of quantum communication and quantum computation.So far,the theories of quantum error correction has become more and more perfect,many counterpart of classical error correction coding technique have been found in quantum area.In this paper,we improve a method of construction of parity check matrix in quantum low density parity check(LDPC) codes based on sparse circle sequence,and compare the performance of our construction method with that of MacKay's.The result shows that our method is not only able to remove some disadvantages of B and U construction,but also to reserve their advantages and improve the efficiency of coding and decoding.
Stabilizer codes are an important branch of quantum codes, but the existing stabilizer codes constructed from the classical binary codes almost exclusively belong to the special subclass of CSS codes. This paper develops simple and systematic constructions for two rich classes of non-CSS quantum stabilizer codes: quantum low density parity check (LDPC) codes based on classical quasi-cyclic LDPC codes and quantum convolutional codes based on classical LDPC-convolutional codes. Both classes enjoy a wide range of lengths and rates, and offer stronger error correction capability than the existing codes.
Based on the lines and points in finite geometry,a method to construct the low density parity check codes is discussed in this paper.According to the characteristics of these codes,the dual codes of this kind of LDPC codes are obtained by splitting the rows or columns of the check matrix.A novel construction method of quantum low-density-parity-check code is developed according to the theory of quantum CSS codes.Quantum code(15,4) is selected as an example to illustrate the availability of this construction method,and its performance is analyzed under the bit-flipping channel.It is shown that this method is easier to construct the dual codes,and the performance of quantum codes constructed is superior to that of classical ones.