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Simple schemes for quantum information processing with W-type entanglement

QUANTUM INFORMATION PROCESSING 2009年第5期8卷 431-442页

作者： Wang, Xin-Wen Yang, Guo-Jian Su, Yu-Huan Xie, Min Beijing Normal Univ Dept Phys Beijing 100875 Peoples R China Beijing Normal Univ Appl Opt Beijing Area Major Lab Beijing 100875 Peoples R China

Simple schemes are proposed for implementing deterministic teleportation, superdense coding, and quantum information splitting with W-type entangled states. The physical realization of these schemes should be much simpler than previous ones due to the assistance of an auxiliary particle. We illustrate the ideas in cavity quantum electrodynamics. The important features of our schemes can also be demonstrated in other systems.

关键词： Teleportation superdense coding Quantum information splitting W state Cavity quantum electrodynamics

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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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Communication Capacity of W States

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2018年第5期57卷 1572-1581页

作者： Li, Junxia Henan Polytech Univ Sch Phys & Elect Informat Engn Jiaozuo 454000 Peoples R China

Tripartite entanglement of three qubits can be classified based on the stochastic local operations and classical communications. Such entanglement are divided into two categories: GHZ states and W states. In this paper, we present the communication capacity of W states of arbitrary n qubits. We firstly evaluate the partition-depended communication capacity of bipartite W states including hyper-entangled W states. And then we compute the concordant communication capacity of W states, which is independent of partitions of W states.

关键词： Quantum entanglement W states Communication capacity Quantum teleportation superdense coding

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Combining multi-photon entanglement, hyper-entanglement and quantum networks for enhanced sensing 22

Combining multi-photon entanglement, hyper-entanglement and ...

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Conference on Radar Sensor Technology XXII

作者： Smith, James F., III Naval Res Lab Code 5741 Washington DC 20375 USA

ISBN: (纸本)9781510617780

Quantum hyper-entanglement, multi-photon entanglement and quantum networks are combined to develop enhanced sensing capabilities. Quantum hyper-entanglement refers to entanglement in more than one degree of freedom, e.g. polarization, energy-time, orbital angular momentum (OAM), and frequency. Multi-photon entanglement involves entanglement typically between more than two photons, whereas hyper-entanglement is generally described as occurring between two photons referred to as the signal and ancilla photon. Multi-photon states representing an increasing hierarchy of robustness are discussed. These include N00N states, M&N states and linear combinations of M&N states. A M&N state, the (N, 1) states is shown to be very useful. A method of constructing M& N states using Shrodinger kitten states is considered. Multi-photon entanglement and hyper-entanglement are combined for enhanced sensing. This combined approach permits improvement in measures of effectiveness (MOEs) like SNR, signal to interference ratio (SIR), time-on-target (TOT), Holevo bound, and system range. The combined approach yields significant improvements in resolution both by permitting an effective reduction in wavelength used for measurement as well as decreasing the related Cramer Rao lower bound. This in turn permits sensors based on these concepts to have enhanced parameter estimation capabilities. These parameters can include range, bearing and elevation. Additional enhancements are found by combining the multi-photon hyper-entangled states with the idea of a quantum network. Quantum networks are a collection of nodes that may have quantum memory. This approach can significantly reduce loss;offer noise and interference resistance;decrease measurement error;and reduce size, weight, power and costs (SWAPC) for the overall system.

关键词： quantum networks multi-photon entanglement hyper-entanglement super resolution and sensitivity quantum communications superdense coding quantum memory quantum sensing Bell state measurement

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Encoding M classical bits in the arrival time of dense-coded photons

Encoding <i>M</i> classical bits in the arrival time of dens...

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Conference on Quantum Optics

作者： Hegazy, Salem F. Morra, Ahmed E. Obayya, Salah S. A. Cairo Univ Natl Inst Laser Enhanced Sci Giza 12613 Egypt Menoufia Univ FEE Menoufia 32952 Egypt Zewail City Sci & Technol Ctr Photon & Smart Mat Giza 12588 Egypt

ISBN: (纸本)9781510601451

We present a scheme to encode M extra classical bits to a dense-coded pair of photons. By tuning the delay of an entangled pair of photons to one of 2(M) time-bins and then applying one of the quantum dense coding protocols, a receiver equipped with a synchronized clock of reference is able to decode M bits (via classical time-bin encoding) + 2 bits (via quantum dense coding). This protocol, yet simple, does not dispense several special features of the used programmable delay apparatus to maintain the coherence of the two-photon state. While this type of time-domain encoding may be thought to be ideally of boundless photonic capacity (by increasing the number of available time-bins), errors due to the environmental noise and the imperfect devices and channel evolve with the number of time-bins.

关键词： Time-bin superdense coding delay line quantum information channel capacity hybrid modulation quantum bit error rate

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Enhanced communication through quantum hyper-entanglement 10

Enhanced communication through quantum hyper-entanglement

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Conference on Quantum Information Science, Sensing, and Computation X

作者： Smith, James F., III Naval Res Lab Code 5741 Washington DC 20375 USA

ISBN: (数字)9781510618329

ISBN: (纸本)9781510618329

Theory and related designs for enhancing communications and more generally information transfer by using quantum hyper-entanglement are discussed. Quantum hyper-entanglement refers to entanglement in more than one quantum mechanical degree of freedom, e.g. polarization, energy-time, orbital angular momentum, radial quantum number and frequency. Each extra degree of freedom increases the dimensionality d of the underlying Hilbert space. The hyperentangled signal-to-noise ratio (SNR) and signal-to-interference ratio (SIR) are d times the related classical quantity due to the enhancement born of hyper-entanglement. Communication time can be reduced by a factor d or d . M , where M is the number of message photons used. Errors in parameter estimation related to information stored in the signal experience a factor of d . M reduction. This paper considers the use of generalized Bell states and discusses circuitry for their transmission, analysis and detection. Holevo bounds and Von-Neumann entropies are calculated for both the hyper-entangled case and non-entangled case. It is shown that hyper-entanglement can increase the maximum information transferrable by more than log(2) (d) bits. The Holevo bound results are discussed in the context of the types of generalized Bell states. Generalized measures of effectiveness (MOEs) are introduced that hold for linear combinations of generalized Bell states. Different sets of complete orthogonal projection operators and their applications are discussed. Loss mechanisms due to transmission hardware such as orbital angular moment polarization rotation, and polarizing beam splitter cross-talk are calculated. Propagation and detection loss as well as noise are considered.

关键词： Holevo bound quantum communication Von Neuman entropy Shannon entropy channel capacity channel matrix generalized Bell state Bell state measurement quantum network/repeater quantum sensing 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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Understanding the Quantum Teleportation Protocol

Understanding the Quantum Teleportation Protocol

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2023 Congress in Computer Science, Computer Engineering, and Applied Computing, CSCE 2023

作者： Spranger, Kurt T. Grimaila, Michael R. Hodson, Douglas D. Air Force Institute of Technology Dept. of Systems Engineering and Mgmt. Wright-Patterson AFBOH United States Air Force Institute of Technology Dept. of Electrical & Computer Engineering Wright-Patterson AFBOH United States

ISBN: (纸本)9798350327595

Decomposing a complex system into smaller abstract functional blocks and developing mathematical models to represent their behavior is an important activity towards developing comprehensive system understanding. In this paper, we decompose the ideal Quantum Teleportation protocol into a collection of simple quantum circuit blocks, examine the behavior of each block, and show how collections of blocks operate to create more complex circuits. We believe this approach greatly simplifies the understanding of how the Quantum Teleportation protocol works. This paper is introductory in nature and is intended to help those who are new to modeling, simulating, and analyzing ideal quantum circuits. © 2023 IEEE.

关键词： Bell State Generation (BSG) Bell State Measurement (BSM) Einstein Podolsky Rosen (EPR) pairs quantum entanglement quantum teleportation superdense coding

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