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superdense coding WITH SINGLE-PARTICLE ENTANGLEMENT

JOURNAL OF RUSSIAN LASER RESEARCH 2009年第5期30卷 427-434页

作者： Dunningham, Jacob A. Univ Leeds Sch Phys & Astron Leeds LS2 9JT W Yorkshire England

Recent work has explored the idea that nonlocality or entanglement involving a single particle should be taken seriously and has real measurable consequences. Theoretical and experimental schemes have shown, for example, that single-particle states can violate Bell's inequalities. Here we discuss the possibility of using single-particle entanglement for implementing a superdense coding protocol. Particle-number superselection rules restrict this scheme to being able to transmit log(2)(3) bits of information. While this falls short of the two-particle limit of two bits, it still exceeds what can be achieved without entanglement.

关键词： nonlocality mode entanglement superdense coding

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EXIT-Chart Aided Code Design for Symbol-Based Entanglement-Assisted Classical Communication over Quantum Channels 80

EXIT-Chart Aided Code Design for Symbol-Based Entanglement-A...

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80th IEEE Vehicular Technology Conference (VTC Fall)

作者： Babar, Zunaira Ng, Soon Xin Hanzo, Lajos Univ Southampton Commun Signal Proc & Control Grp Southampton SO17 1BJ Hants England

ISBN: (纸本)9781479944491

Quantum-based transmission is an attractive solution conceived for achieving absolute security. In this quest, we have conceived an EXtrinsic Information Transfer (EXIT) chart aided channel code design for symbol-based entanglement-assisted classical communication over quantum depolarizing channels. Our proposed concatenated code design incorporates a Convolutional Code (CC), a symbol-based Unity Rate Code (URC) and a soft-decision aided 2-qubit superdense Code (2SD), which is hence referred to as a CC-URC-2SD arrangement. We have optimized our design with the aid of non-binary EXIT charts. Our proposed design operates within 1 dB of the achievable capacity, providing attractive performance gains over its bit-based counterpart. Quantitatively, the bit-based scheme requires 60% more iterations than our symbol-based scheme for the sake of achieving perfect decoding convergence. Furthermore, we demonstrate that the decoding complexity can be reduced by using memory-2 and memory-3 convolutional codes, while still outperforming the bit-based approach.

关键词： Entanglement-Assisted Classical Communication superdense coding Non-Binary EXIT Charts Iterative Decoding

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Quantum Hyperdense coding 2

Quantum Hyperdense Coding

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Conference on Emerging Technologies in Security and Defence II;and Quantum-Physics-based Information Security III

作者： Graham, T. M. Kwiat, P. G. Univ Illinois Dept Phys Urbana IL USA

ISBN: (纸本)9781628413175

We present a method, known as hyperdense coding, which uses photons hyperentangled in polarization and temporal mode to transmit up to 2.81 bits/photon of classical information over a two-qubit quantum channel. Furthermore, the hyperentangled photons used in this approach are much less susceptible to the influences of turbulence than spatial qubits, allowing for turbulence-resistant communication. We compare this technique to previously implemented hyperentanglement-enhanced superdense coding implementations which have a maximum theoretical channel capacity of 2 bits/photon.

关键词： Quantum Communication Hyperentanglement superdense coding Hyperdense coding

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High-capacity three-party quantum secret sharing with superdense coding

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Chinese Physics B 2009年第11期18卷 4690-4694页

作者：顾斌李传起徐飞陈玉林 College of Math and Physics Nanjing University of Information Science and Technology (NUIST)

This paper presents a scheme for high-capacity three-party quantum secret sharing with quantum superdense coding, following some ideas in the work by Liuet al （2002 Phys. Rev. A 65 022304） and the quantum secret sharing scheme by Deng et al （2008 Phys. Lett. A 372 1957）. Instead of using two sets of nonorthogonal states, the boss Alice needs only to prepare a sequence of Einstei^Podolsky-l^osen pairs in d-dimension. The two agents Bob and Charlie encode their information with dense coding unitary operations, and security is checked by inserting decoy photons. The scheme has a high capacity and intrinsic efficiency as each pair can carry 21bd bits of information, and almost all the pairs can be used for carrying useful information.

关键词： quantum secret sharing three-party high-capacity superdense coding

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EXIT-Chart Aided Code Design for Symbol-Based Entanglement-Assisted Classical Communication over Quantum Channels

EXIT-Chart Aided Code Design for Symbol-Based Entanglement-A...

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IEEE Vehicular Technology Conference

作者： Zunaira Babar Soon Xin Ng Lajos Hanzo Communications Signal Processing and Control Group University of Southampton

ISBN: (纸本)9781479944484

关键词： Entanglement-Assisted Classical Communication superdense coding Non-Binary EXIT Charts Iterative Decoding

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Near-Capacity Code Design for Entanglement-Assisted Classical Communication over Quantum Depolarizing Channels

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IEEE TRANSACTIONS ON COMMUNICATIONS 2013年第12期61卷 4801-4807页

作者： Babar, Zunaira Ng, Soon Xin Hanzo, Lajos Univ Southampton Sch Elect & Comp Sci Commun Signal Proc & Control Grp Southampton SO17 1BJ Hants England Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

We have conceived a near-capacity code design for entanglement-assisted classical communication over the quantum depolarizing channel. The proposed system relies on efficient near-capacity classical code designs for approaching the entanglement-assisted classical capacity of a quantum depolarizing channel. It incorporates an Irregular Convolutional Code (IRCC), a Unity Rate Code (URC) and a soft-decision aided superdense Code (SD), which is hence referred to as an IRCC-URC-SD arrangement. Furthermore, the entanglement-assisted classical capacity of an N-qubit superdense code transmitted over a depolarizing channel is invoked for benchmarking. It is demonstrated that the proposed system operates within 0.4 dB of the achievable noise limit for both 2-qubit as well as 3-qubit SD schemes. More specifically, our design exhibits a deviation of only 0.062 and 0.031 classical bits per channel use from the corresponding 2-qubit and 3-qubit capacity limits, respectively. The proposed system is also benchmarked against the classical convolutional and turbo codes.

关键词： Entanglement-assisted classical communication superdense coding irregular convolutional codes EXIT charts near-capacity design

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Quantum Private Comparison: A Review

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IETE TECHNICAL REVIEW 2013年第5期30卷 439-445页

作者： Liu, Wenjie Liu, Chao Wang, Haibin Jia, Tingting Nanjing Univ Informat Sci & Technol Jiangsu Engn Ctr Network Monitoring Nanjing Jiangsu Peoples R China Nanjing Univ Informat Sci & Technol Sch Comp & Software Nanjing Jiangsu Peoples R China

As an important branch of quantum secure multiparty computation, quantum private comparison (QPC) has attracted more and more attention recently. In this paper, according to the quantum implementation mechanism that these protocols used, we divide these protocols into three categories: The quantum cryptography QPC, the superdense coding QPC, and the entanglement swapping QPC. And then, a more in-depth analysis on the research progress, design idea, and substantive characteristics of corresponding QPC categories is carried out, respectively. Finally, the applications of QPC and quantum secure multi-party computation issues are discussed and, in addition, three possible research mainstream directions are pointed out.

关键词： Entanglement swapping Quantum cryptography Quantum private comparison Quantum secure multi-party computation superdense coding

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Quantum Private Comparison Using Genuine Four-Particle Entangled States

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2012年第4期51卷 1187-1194页

作者： Jia, Heng-Yue Wen, Qiao-Yan Li, Yan-Bing Gao, Fei Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China Xidian Univ State Key Lab Integrated Serv Network Xian 710071 Peoples R China

In this paper, a quantum private comparison protocol is proposed based on chi-type state. According to the protocol, two parties can determine the equality of their information with the assistant of a semi-honest third party. Due to utilizing quantum superdense coding, this protocol provides a high efficiency and capacity. Moreover, its security is also discussed.

关键词： Private comparison chi-Type state superdense coding Entanglement swapping

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Scheme for Implementing Quantum Dense coding with -Type Entangled States in Optical Systems

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2012年第6期51卷 1917-1923页

作者： Yang, Yu-Guang Xia, Juan Jia, Xin Zhang, Hua Beijing Univ Technol Coll Comp Sci & Technol Beijing 100124 Peoples R China Xidian Univ State Key Lab Integrated Serv Network Xian 710071 Peoples R China Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

A novel scheme for realizing dense coding with -type entangled states in linear optical system is proposed. In this protocol, Alice encodes her classical information on photons by linear optical elements and sends these photons to Bob. Then Bob performs a sequent single-qubit measurement on all photons in the -type entangled state by employing linear optical elements. According to the outcomes of his measurement, Bob can determine what operation Alice performed. The scheme is based on linear optical elements, which is feasible with existing experimental technology.

关键词： chi-Type entangled state superdense coding Linear optical elements

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A SUFFICIENT AND NECESSARY CONDITION FOR superdense coding OF QUANTUM STATES

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INTERNATIONAL JOURNAL OF QUANTUM INFORMATION 2008年第5期6卷 1115-1125页

作者： Qiu, Daowen Zhongshan Univ Dept Comp Sci Guangzhou 510275 Guangdong Peoples R China

Recently, Harrow et al. [Phys. Rev. Lett. 92 ( 2004) 187901] gave a method for preparing an arbitrary quantum state with high success probability by physically transmitting some qubits, and by consuming a maximally entangled state, together with exhausting some shared random bits. In this paper, we discover that some states are impossible to be perfectly prepared by Alice and Bob initially sharing some entangled states. In particular, we present a sufficient and necessary condition for the states being enabled to be exactly prepared with probability equal to unity, in terms of the initial entangled states (maybe nonmaximally). In contrast, if the initially shared entanglement is maximal, then the probabilities for preparing these quantum states are smaller than unity. Furthermore, the lower bound on the probability for preparing some states are derived.

关键词： superdense coding entanglement communication

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