Showing 2009 · quant-phShow all

33 papers · 2 filters

quant-ph2009★ 3 cited

Local Unambiguous Discrimination with Remaining Entanglement

Yangjia Li, Runyao Duan, Mingsheng Ying

A bipartite state which is secretly chosen from a finite set of known entangled pure states cannot be immediately useful in standard quantum information processing tasks. To effect…

quant-ph2009★ 27 cited

The n-tangle of odd n qubits

D. Li

Coffman, Kundu and Wootters presented the 3-tangle of three qubits in [Phys. Rev. A 61, 052306 (2000)]. Wong and Christensen extended the 3-tangle to even number of qubits, known a…

quant-ph2009★ 529 cited

Quantum computations without definite causal structure

G. Chiribella, G. M. D'Ariano, P. Perinotti +1

We show that quantum theory allows for transformations of black boxes that cannot be realized by inserting the input black boxes within a circuit in a pre-defined causal order. The…

quant-ph2009★ 100 cited

Tunable Electromagnetically Induced Transparency and Absorption with Dressed Superconducting Qubits

Hou Ian, Yu-xi Liu, Franco Nori

Electromagnetically induced transparency and absorption (EIT and EIA) are usually demonstrated by three-level atomic or atom-like systems. In contrast to the usual case, we theoret…

quant-ph2009★ 20 cited

Transition from weak to strong measurements by nonlinear quantum feedback control

Jing Zhang, Yu-xi Liu, Re-Bing Wu +2

We find that feedback control may induce "pseudo" nonlinear dynamics in a damped harmonic oscillator, whose centroid trajectory in the phase space behaves like a classical nonlinea…

quant-ph2009★ 32 cited

The Tensor Rank of the Tripartite State }

Nengkun Yu, Eric Chitambar, Cheng Guo +1

Tensor rank refers to the number of product states needed to express a given multipartite quantum state. Its non-additivity as an entanglement measure has recently been observed. I…

quant-ph2009

Enhanced squeezing with parity kicks

Xiao-Tong Ni, Yu-Xi Liu, L C Kwek +1

Using exponential quadratic operators, we present a general framework for studying the exact dynamics of system-bath interaction in which the Hamiltonian is described by the quadra…

quant-ph2009★ 28 cited

The role of controllability in optimizing quantum dynamics

Re-Bing Wu, Michael A. Hsieh, Herschel Rabitz

This paper discusses the important role of controllability played on the complexity of optimizing quantum mechanical control systems. The study is based on a topology analysis of t…

quant-ph2009★ 5 cited

Stochastic local operations and classical communication equations and classification of even qubits

X. Li, D. Li

For any even qubits we establish four SLOCC equations and construct four SLOCC polynomials (not complete) of degree , which can be exploited for SLOCC classification (…

quant-ph2009★ 172 cited

Qubit-induced phonon blockade as a signature of quantum behavior in nanomechanical resonators

Yu-xi Liu, Adam Miranowicz, Y. B. Gao +3

The observation of quantized nanomechanical oscillations by detecting femtometer-scale displacements is a significant challenge for experimentalists. We propose that phonon blockad…

quant-ph2009★ 111 cited

Sudden vanishing of spin squeezing under decoherence

Xiaoguang Wang, Adam Miranowicz, Yu-xi Liu +2

In order to witness multipartite correlations beyond pairwise entanglement, spin-squeezing parameters are analytically calculated for a spin ensemble in a collective initial state…

quant-ph2009★ 157 cited

Controlling the transport of single photons by tuning the frequency of either one or two cavities in an array of coupled cavities

Jie-Qiao Liao, Z. R. Gong, Lan Zhou +3

We theoretically study how to control transport, bound states, and resonant states of a single photon in a one-dimensional coupled-cavity array. We find that the transport of a sin…

quant-ph2009★ 8 cited

Optimal Simulation of a Perfect Entangler

Nengkun Yu, Runyao Duan, Mingsheng Ying

A unitary operation is called a perfect entangler if it can generate a maximally entangled state from some unentangled input. We study the following question: How many…

quant-ph2009★ 240 cited

200km Decoy-state quantum key distribution with photon polarization

Teng-Yun Chen, Jian Wang, Yang Liu +10

We demonstrate the decoy-state quantum key distribution over 200 km with photon polarization through optical fiber, by using super-conducting single photon detector with a repetiti…

quant-ph2009★ 31 cited

1.5um Polarization-Entangled Bell States Generation Based on Birefringence in High Nonlinear Microstructure Fiber

Qiang Zhou, Wei Zhang, Jierong Cheng +2

Polarization-entangled photon pair generation based on two scalar scattering processes of the vector four photon scattering has been demonstrated experimentally in high nonlinear m…

quant-ph2009★ 13 cited

Tripartite to Bipartite Entanglement Transformations and Polynomial Identity Testing

Eric Chitambar, Runyao Duan, Yaoyun Shi

We consider the problem of deciding if a given three-party entangled pure state can be converted, with a non-zero success probability, into a given two-party pure state through loc…

quant-ph2009★ 126 cited

The Perfect Distinguishability of Quantum Operations

Runyao Duan, Yuan Feng, Mingsheng Ying

We provide a feasible necessary and sufficient condition for when an unknown quantum operation (quantum device) secretely selected from a set of known quantum operations can be ide…

quant-ph2009★ 65 cited

Singularities of Quantum Control Landscapes

Rebing Wu, Jason Dominy, Tak-San Ho +1

A quantum control landscape is defined as the objective to be optimized as a function of the control variables. Existing empirical and theoretical studies reveal that most realisti…

quant-ph2009★ 78 cited

Phase gate of one superconducting qubit simultaneously controlling n qubits in a cavity

Chui-Ping Yang, Yu-xi Liu, Franco Nori

We propose how to realize a three-step controlled-phase gate of one superconducting qubit simultaneously controlling n qubits selected from N qubits in a cavity (1<n<N). The operat…

quant-ph2009★ 16 cited

The Optimal Control Landscape for the Generation of Unitary Transformations with Constrained Dynamics

Michael Hsieh, Rebing Wu, Herschel Rabitz +1

The reliable and precise generation of quantum unitary transformations is essential to the realization of a number of fundamental objectives, such as quantum control and quantum in…

quant-ph2009★ 37 cited

Measurement-based quantum phase estimation algorithm for finding eigenvalues of non-unitary matrices

Hefeng Wang, Lian-Ao Wu, Yu-xi Liu +1

We propose a quantum algorithm for finding eigenvalues of non-unitary matrices. We show how to construct, through interactions in a quantum system and projective measurements, a no…

quant-ph2009★ 40 cited

A short impossibility proof of Quantum Bit Commitment

G. Chiribella, G. M. D'Ariano, P. Perinotti +2

Bit commitment protocols, whose security is based on the laws of quantum mechanics alone, are generally held to be impossible on the basis of a concealment-bindingness tradeoff. A…

quant-ph2009★ 120 cited

Multi-Stability of Electromagnetically Induced Transparency in Atom-Assisted Optomechanical Cavities

Yue Chang, T. Shi, Yu-xi Liu +2

We study how an oscillating mirror affects the electromagnetically induced transparency (EIT) of an atomic ensemble, which is confined in a gas cell placed inside a micro-cavity wi…

quant-ph2009★ 104 cited

Quantum switch for single-photon transport in a coupled superconducting transmission line resonator array

Jie-Qiao Liao, Jin-Feng Huang, Yu-xi Liu +2

We propose and study an approach to realize quantum switch for single-photon transport in a coupled superconducting transmission line resonator (TLR) array with one controllable ho…