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Fast nuclear-spin gates and electrons−nuclei entanglement of neutral atoms in weak magnetic fields

Frontiers of physics 2024年第2期19卷 179-203页

作者： Xiao-Feng Shi School of Physics Xidian UniversityXi’an 710071China

We present a novel class of Rydberg-mediated nuclear-spin entanglement in divalent atoms with global laser ***,we show a fast nuclear-spin controlled phase gate of an arbitrary phase realizable either with two laser pulses when assisted by Stark shifts,or with three ***,we propose to create an electrons−nuclei-entangled state,which is named a super bell state(SBS)for it mimics a large Bell state incorporating three small Bell ***,we show a protocol to create a three-atom electrons-nuclei entangled state which contains the three-body W and Greenberger−Horne−Zeilinger(GHZ)states *** protocols possess high intrinsic fidelities,do not require single-site Rydberg addressing,and can be executed with large Rydberg Rabi frequencies in a weak,Gauss-scale magnetic *** latter two protocols can enable measurement-based preparation of Bell,hyperentangled,and GHZ states,and,specifically,SBS can enable quantum dense coding where one can share three classical bits of information by sending one particle.

关键词： nuclear-spin qubit electrons−nuclei entanglement super Bell state Greenberger−Horne−Zeilinger state Rydberg-mediated entanglement quantum dense coding

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dense coding in a Three-Qubit Heisenberg XXZ Spin Chain with Three-Site Interactions

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2019年第2期58卷 364-371页

作者： Aili, Mairikena Abulizi, Aihemaiti Xinjiang Normal Univ Inst Phys & Elect Engn Xinyilu Rd 102 Urumqi 830054 Peoples R China

This paper investigates the quantum dense coding of a three-qubit XXZ Heisenberg spin chain at thermal equilibrium, with three-site interactions in the presence of an external magnetic field. We analyze the effects of various system parameters on the dense coding in multiple cases with different types of three-site interactions. The results show that the most ideal case for dense coding is the model including both types of three-site interactions, with the imposed condition of XZX+YZY type of three-site interaction is larger than the XZY-YZX type of three-site interaction. The inclusion of the z direction coupling parameter J(Z), and external magnetic parameter B are found to be effective for optimizing the dense coding capacity, while the temperature T is turned out to be destructive. Moreover, the ferromagnet (FM) is shown to be more ideal for quantum dense coding than the antiferromagnet (AFM). For FM, by comparing the two types of three-site interactions (XZY-YZX and XZX+YZY), the appropriate model for valid dense coding is suggested and their dominant regions are clarified.

关键词： quantum dense coding Capacity Heisenberg model Three-site interaction

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New quantum Key Distribution Scheme Based on Random Hybrid quantum Channel with EPR Pairs and GHZ States

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INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS 2018年第9期57卷 2648-2656页

作者： Yan, Xing-Yu Gong, Li-Hua Chen, Hua-Ying Zhou, Nan-Run Nanchang Univ Dept Elect Informat Engn Nanchang 330031 Jiangxi Peoples R China Univ Pittsburgh Dept Elect & Comp Engn Pittsburgh PA 15261 USA Nanchang Univ Dept Phys Nanchang 330031 Jiangxi Peoples R China

A theoretical quantum key distribution scheme based on random hybrid quantum channel with EPR pairs and GHZ states is devised. In this scheme, EPR pairs and tripartite GHZ states are exploited to set up random hybrid quantum channel. Only one photon in each entangled state is necessary to run forth and back in the channel. The security of the quantum key distribution scheme is guaranteed by more than one round of eavesdropping check procedures. It is of high capacity since one particle could carry more than two bits of information via quantum dense coding.

关键词： quantum key distribution Random hybrid quantum channel quantum dense coding quantum cryptography

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CONDITIONS FOR BIPARTITE GENERAL BELL STATES

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INTERNATIONAL JOURNAL OF quantum INFORMATION 2010年第7期8卷 1213-1217页

作者： Wang, Zhen Tian, Li-Jie Cao, Wenzhen Liaoning Normal Univ Coll Phys & Elect Technol Dalian 116029 Peoples R China Ludong Univ Sch Phys & Elect Engn Yantai 264025 Peoples R China Dalian Univ Technol Sch Phys & Optoelect Engn Dalian 116024 Peoples R China

Utilizing the notation in Refs. 10 and 11, we revisit general bipartite Bell state for any (d x d) dimensional systems. In particular, we bring out the conditions for general bipartite Bell state and find out the relation between general Bell states and the u(d) group. Furthermore, we construct local unitary complete set for quantum dense coding based on general Bell states.

关键词： Bipartite general Bell state quantum entanglement quantum dense coding

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Continuous variable quantum key distribution via a simultaneous optical-wireless up-down-link system

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OPTIK 2010年第17期121卷 1540-1544页

作者： Suchat, S. Pornsuwancharoen, N. Yupapin, P. P. King Mongkuts Inst Technol Ladkrabang Adv Photon Res Ctr Fac Sci Bangkok 10520 Thailand Phranakhon Rajabhat Univ Fac Sci & Technol Bangkok 10220 Thailand Rajamangala Univ Technol Isan Fac Ind & Technol Dept Elect Sakon Nakon 47160 Thailand

We propose a remarkably simple system of a continuous variable quantum key distribution using chaotic signals generated by a soliton pulse within a nonlinear micro-ring resonator system. By using the appropriate soliton input power and micro-ring parameters, continuous signals are generated spreading over the spectrum. Polarized photons are formed incorporating the polarization control unit into the micro-ring system, which allows different time slot entangled photons to be randomly formed. Two different frequency bands for up down-link converters can be selected (filtered) and performed, which is available for the simultaneous up down-link application in the telephone networks. Results obtained have shown that the application of such a system for continuous variable quantum cryptography via optical-wireless up down-link converters within a single system is plausible. (C) 2009 Elsevier GmbH. All rights reserved.

关键词： Continuous variable quantum key distribution Optical-wireless link quantum dense coding

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Comment on: "dense coding and teleportation with one-dimensional cluster states" [Phys. Lett. A 364 (2007) 7]

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PHYSICS LETTERS A 2008年第37期372卷 5938-5940页

作者： Yuan, Hao Liu, Yi-Min Zhang, Zhan-jun Anhui Univ Sch Phys & Mat Sci Hefei 230039 Peoples R China Shaoguan Univ Dept Phys Shaoguan 512005 Peoples R China

The schemes on quantum dense coding and teleportation [Phys. Lett. A 364 (2007) 7] are revisited. By reformulizing one-dimensional n-qubit cluster states, we decompose the necessary multi-qubit collective unitary operation into a sequence of single-qubit Hadamard (H) and two-qubit controlled-not (C) operations. Our reduction makes the schemes feasible today. (C) 2008 Published by Elsevier B.V.

关键词： quantum dense coding quantum teleportation one-dimensional n-qubit cluster states

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On the decoding of non-binary quantum low-density parity check codes

On the decoding of non-binary quantum low-density parity che...

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International Conference on ICT Convergence (ICTC) - Future Creative Convergence Technologies for New ICT Ecosystems

作者： Hwang, Yongsoo Jeon, Moongu Ham, Byoung Seung Gwangju Inst Sci & Technol Dept Informat & Commun Kwangju 500712 South Korea

This paper discusses the decoding of a non-binary quantum low-density parity check code with considerations about the degeneracy problem in quantum coding theory.

ISBN: (纸本)9781479906987

This paper discusses the decoding of a non-binary quantum low-density parity check code with considerations about the degeneracy problem in quantum coding theory.

关键词： degeneracy problem coding theory non-binary Shannon's theory low density parity check codes DEcoding parity check codes quantum dense coding quanta

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Three-party quantum Secret Sharing based on Secure Direct Communication

Three-party Quantum Secret Sharing based on Secure Direct Co...

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International Forum on Information Technology and Applications (IFITA 2009)

作者： Liu Yanyan Xu Chengqian Yanshan Univ Coll Informat Sci & Engn Qinhuangdao 066004 Hebei Peoples R China

ISBN: (纸本)9780769536002

Inspired by quantum secure direct communication and quantum dense coding, we present a three-party quantum secret sharing (QSS) scheme by quantum teleportation. After performing the rectilinear basis or diagonal basis measurement randomly for the eavesdropping check to ensure the security of the quantum channel, the sender encodes the secret messages directly on a series of Einstein-Podolsky-Rosen (EPR) pairs and transmits them to the receivers by quantum teleportation. Neither of the receivers can decode the secret messages on his own even if they collaborate. Only the two receivers combine their measurement results with the sender's result, can they recover the secret messages. In this scheme, one qubit can encode two bits of classical information because quantum dense coding is introduced. Using quantum teleportation, the distinct advantage of this scheme is that there is not the transmission of qubits carrying the secret messages in the quantum channel, it is absolutely secure for QSS if a perfect channel is used.

关键词： quantum cryptography quantum secret sharing quantum secure direct communication quantum teleportation quantum dense coding

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On the Hardness of Decoding quantum Stabilizer Codes under the Depolarizing Channel

On the Hardness of Decoding Quantum Stabilizer Codes under t...

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International Symposium on Information Theory and its Applications (ISITA)

作者： Kuo, Kao-Yueh Lu, Chung-Chin Natl Tsing Hua Univ Dept Elect Engn Hsinchu 30013 Taiwan

ISBN: (纸本)9784885522673

We classify the complexity classes of several important decoding problems for quantum stabilizer codes. First, regardless of the channel model, quantum bounded distance decoding is shown to be NP-hard, like what Berlekamp, McEliece and Tilborg did for classical binary linear codes in 1978. Then under the depolarizing channel, the decoding problems for finding a most likely error and for minimizing the decoding error probability are also shown to be NP-hard. Our results indicate that finding a polynomial-time decoding algorithm for general stabilizer codes may not be possible, but this, on the other hand, strengthens the foundation of quantum code-based cryptography.

关键词： complexity classes Depolarization Nondeterministic polynomial-time hard DEcoding Stabilizing agents Stabilizer Device Component Codes Soundness quanta hardness Error probability quantum dense coding

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An experiment of optical encryption technique with quantum security for mobile phone up-link converter

An experiment of optical encryption technique with quantum s...

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IEEE International Conference on Industrial Technology

作者： Suchat, S Paiboon, S Yupapin, PP Kings Mongkuts Inst Technol Ladkrabang Fac Sci Dept Appl Phys Lightwave Technol Res Ctr Bangkok 10520 Thailand

ISBN: (纸本)0780376579

The data encryption/decryption is employed to secure the transported data that is now become very importance issue for communication and networks. However, the general encryption is not absolute secure of the required information. The absolute security technique is known as quantum security where the principle of the technique is that the required data is encrypted/decrypted by quantum transported channel. The transported signals are randomly coded/decoded by using the quantum entanglement pairs. The quantum entangle is created by using a single pulse i.e. single photon that occupies the random polarization states, where the required polarization states can be formed be sender and receiver at any time linking by quantum channel. In this paper, the single pulse is created by a CW laser diode that is launched into the classical Mach-Zehnder Interferometer. The single pulse is generated and detected when a light beam is modulated by signal from signal generator with suitable driven frequency on a LiNbO3 crystal. Then the entanglement signals can be realized and transmitted via classical optical system. The quantum dense coding can also be performed by the technique of dense wavelength division multiplexing technique, where each of transmitted wavelengths can be randomly formed entanglement pairs, then the dense code/decode schemes can be employed and linked via cable or wireless transmission.

关键词： quantum encryption/decryption quantum dense coding

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