Yang, Jing Huang, Yanxia
Published in
Quantum Information Processing

Tripartite and bipartite quantum correlations in the three-qubit XXZ Heisenberg spin chain with two types of three-site interactions and an external magnetic field are investigated. We show that the increase in XZY − YZX interaction can enhance the robustness of both tripartite and bipartite correlations, whereas the increase in XZX +\documentclass...

Yan, Fei Chen, Kehan Venegas-Andraca, Salvador E. Zhao, Jianping
Published in
Quantum Information Processing

In this paper, a novel method of quantum image rotation (QIR) based on shear transformations on NEQR quantum images is proposed. To compute the horizontal and vertical shear mappings required for rotation, we have designed quantum self-adder, quantum control multiplier, and quantum interpolation circuits as the basic computing units in the QIR impl...

Tomamichel, Marco Martinez-Mateo, Jesus Pacher, Christoph Elkouss, David
Published in
Quantum Information Processing

The security of quantum key distribution protocols is guaranteed by the laws of quantum mechanics. However, a precise analysis of the security properties requires tools from both classical cryptography and information theory. Here, we employ recent results in non-asymptotic classical information theory to show that one-way information reconciliatio...

Zhu, Xue-Na Li-Jost, Xianqing Fei, Shao-Ming
Published in
Quantum Information Processing

We study monogamy relations for arbitrary dimensional multipartite systems. Monogamy relations based on concurrence and concurrence of assistance for any dimensional m1⊗m2⊗⋯⊗mN\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgre...

Gou, Yi-Tao Shi, Hai-Long Wang, Xiao-Hui Liu, Si-Yuan
Published in
Quantum Information Processing

In order to effectively use partially entangled pairs, we consider two kinds of generalized bidirectional quantum teleportation (GBQT) protocols in the different cases: (I) Alice and Bob send messages to each other, and (II) Bob replays Alice after he received Alice’s message, where partially entangled pairs are utilized as the quantum channels. Ho...

Ferraro, E. Fanciulli, M. De Michielis, M.
Published in
Quantum Information Processing

Explicit controlled-NOT gate sequences between two qubits of different types are presented in view of applications for large-scale quantum computation. Here, the building blocks for such composite systems are qubits based on the electrostatically confined electronic spin in semiconductor quantum dots. For each system the effective Hamiltonian model...

Fu, Jing-Heng Zhang, Guo-Feng
Published in
Quantum Information Processing

The effect of three-spin interaction k on thermal entanglement between alternate qubits is studied using pairwise concurrence C and energy-level diagram. It is found that k breaks the symmetry about the effect of magnetic field h on C. It shifts a dip structure and gradually effaces a boot structure when kJ\documentclass[12pt]{minimal} \usepackage{...

Ha, Donghoon Kwon, Younghun
Published in
Quantum Information Processing

In this paper we consider the optimal discrimination of two mixed qubit states for a measurement that allows a fixed rate of inconclusive results. Our strategy is to transform the problem of two qubit states into a minimum error discrimination for three qubit states by adding a specific quantum state ρ0\documentclass[12pt]{minimal} \usepackage{amsm...

Xu, Guang-Bao Wen, Qiao-Yan Gao, Fei Qin, Su-Juan Zuo, Hui-Juan
Published in
Quantum Information Processing

So far, very little is known about local indistinguishability of multipartite orthogonal product bases except some special cases. We first give a method to construct an orthogonal product basis with n parties each holding a 12(n+1)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \use...

Maziero, Jonas
Published in
Quantum Information Processing

Using Bloch’s parametrization for qudits (d-level quantum systems), we write the Hilbert–Schmidt distance (HSD) between two generic n-qudit states as an Euclidean distance between two vectors of observables mean values in RΠs=1nds2-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \u...