Showing 2013 · quant-phShow all

68 papers · 2 filters

quant-ph2013★ 2 cited

The Garden Hose Complexity for the Equality Function

Well Y. Chiu, Mario Szegedy, Chengu Wang +1

The garden hose complexity is a new communication complexity introduced by H. Buhrman, S. Fehr, C. Schaffner and F. Speelman [BFSS13] to analyze position-based cryptography protoco…

quant-ph2013

Topological order away from equilibrium

Alioscia Hamma

Topological ordered states are exotic quantum states of matter that defy the usual description in terms of symmetry breaking and local order parameters. The type or order they feat…

quant-ph2013★ 82 cited

How Discord underlies the Noise Resilience of Quantum Illumination

Christian Weedbrook, Stefano Pirandola, Jayne Thompson +2

The benefits of entanglement can outlast entanglement itself. In quantum illumination, entanglement is employed to better detect reflecting objects in environments so noisy that al…

quant-ph2013★ 262 cited

Tracking Photon Jumps with Repeated Quantum Non-Demolition Parity Measurements

L. Sun, A. Petrenko, Z. Leghtas +11

Quantum error correction (QEC) is required for a practical quantum computer because of the fragile nature of quantum information. In QEC, information is redundantly stored in a lar…

quant-ph2013★ 35 cited

Room-temperature ultra-sensitive mass spectrometer via dynamic decoupling

Nan Zhao, Zhang-qi Yin

We propose an ultra-sensitive mass spectrometer based on a coupled quantum-bit-oscillator system. Under dynamical decoupling control of the quantum bit (qubit), the qubit coherence…

quant-ph2013★ 48 cited

Generation of correlated photon pairs in micro/nano-fibers

Liang Cui, Xiaoying Li, Cheng Guo +4

We study the generation of correlated photon pairs via spontaneous four wave mixing in a 15 cm long micro/nano-fiber (MNF). The MNF is properly fabricated to satisfy the phase matc…

quant-ph2013★ 38 cited

Experimental realization of post-selected weak measurements on an NMR quantum processor

Dawei Lu, Aharon Brodutch, Jun Li +2

The ability to post-select the outcomes of an experiment is a useful theoretical concept and experimental tool. In the context of weak measurements post-selection can lead to surpr…

quant-ph2013★ 89 cited

Scalable Implementation of Boson Sampling with Trapped Ions

Chao Shen, Zhen Zhang, Luming Duan

Boson sampling solves a classically intractable problem by sampling from a probability distribution given by matrix permanents. We propose a scalable implementation of Boson sampli…

quant-ph2013★ 94 cited

Electromagnetically induced transparency and Autler-Townes splitting in superconducting flux quantum circuits

Hui-Chen Sun, Yu-xi Liu, J. Q. You +2

We study the microwave absorption of a driven three-level quantum system, which is realized by a superconducting flux quantum circuit (SFQC), with a magnetic driving field applied…

quant-ph2013★ 16 cited

Local convertibility of the ground state of the perturbed Toric code

Siddhartha Santra, Alioscia Hamma, Lukasz Cincio +3

We present analytical and numerical studies of the behaviour of the -Renyi entropies in the Toric code in presence of several types of perturbations aimed at studying the simula…

quant-ph2013★ 12 cited

Controlled entanglement routing between two virtual pathways

Qiang Zhou, Shuai Dong, Wei Zhang +5

We demonstrate controlled entanglement routing between bunching and antibunching path-entangled two-photon states in an unbalanced Mach-Zehnder interferometer (UMZI), in which the…

quant-ph2013★ 15 cited

Single-Valued Hamiltonian via Legendre-Fenchel Transformation and Time Translation Symmetry

Huan-Hang Chi, Hong-Jian He

Under conventional Legendre transformation, systems with a non-convex Lagrangian will result in a multi-valued Hamiltonian as a function of conjugate momentum. This causes problems…

quant-ph2013★ 18 cited

Quantum algorithm for universal implementation of projective measurement of energy

Shojun Nakayama, Akihito Soeda, Mio Murao

A projective measurement of energy (PME) on a quantum system is a quantum measurement, determined by the Hamiltonian of the system. PME protocols exist when the Hamiltonian is give…

quant-ph2013★ 91 cited

Emergent irreversibility and entanglement spectrum statistics

Claudio Chamon, Alioscia Hamma, Eduardo R. Mucciolo

We study the problem of irreversibility when the dynamical evolution of a many-body system is described by a stochastic quantum circuit. Such evolution is more general than a Hamil…

quant-ph2013★ 15 cited

Computational complexity of time-dependent density functional theory

J. D. Whitfield, M. -H. Yung, D. G. Tempel +2

Time-dependent density functional theory (TDDFT) is rapidly emerging as a premier method for solving dynamical many-body problems in physics and chemistry. The mathematical foundat…

quant-ph2013★ 1.2k cited

Enhancing the sensitivity of the LIGO gravitational wave detector by using squeezed states of light

The LIGO Scientific Collaboration

Nearly a century after Einstein first predicted the existence of gravitational waves, a global network of earth-based gravitational wave observatories is seeking to directly detect…

quant-ph2013★ 60 cited

Generalized three-intensity decoy state method for measurement device independent quantum key distribution

Z. -W. Yu, Y. -H. Zhou, Xiang-Bin Wang

We present improved results and more general results for the decoy-state measurement device independent quantum key distribution (MDI-QKD) where the intensities of all 3 pulses can…

quant-ph2013★ 10 cited

Feedback-induced nonlinearity and superconducting on-chip quantum optics

Zhong-Peng Liu, Hui Wang, Jing Zhang +3

Quantum coherent feedback has been proven to be an efficient way to tune the dynamics of quantum optical systems and, recently, those of solid-state quantum circuits. Here, inspire…

quant-ph2013★ 2 cited

Decoy state method for measurement device independent quantum key distribution with different intensities in only one basis

Zong-Wen Yu, Yi-Heng Zhou, Xiang-bin Wang

We show that the three-intensity protocol for measurement device independent quantum key distribution (MDI QKD) can be done with different light intensities in {\em only one} basis…

quant-ph2013★ 63 cited

Obtain -state from three-qubit -state on rate 1

Nengkun Yu, Cheng Guo, Runyao Duan

In this paper, we study the entanglement transformation rate between multipartite states under stochastic local operations and classical communication (SLOCC). Firstly, we show tha…

quant-ph2013★ 25 cited

Quantum estimation of magnetic-field gradient using W-state

H. T. Ng, K. Kim

We study the precision limits of detecting a linear magnetic-field gradient by using W-states in the presence of different types of noises. We consider to use an atomic spin chain…

quant-ph2013★ 65 cited

Measurement-device-independent quantum key distribution with uncharacterized qubit sources

Zhen-Qiang Yin, Chi-Hang Fred Fung, Xiongfeng Ma +6

Measurement-device-independent quantum key distribution (MDIQKD) is proposed to be secure against any possible detection attacks. The security of the original proposal relies on th…

quant-ph2013★ 103 cited

Memory-assisted measurement-device-independent quantum key distribution

Christiana Panayi, Mohsen Razavi, Xiongfeng Ma +1

A protocol with the potential of beating the existing distance records for conventional quantum key distribution (QKD) systems is proposed. It borrows ideas from quantum repeaters…

quant-ph2013

Particle-hole entanglement of ultracold atoms in an optical lattice

H. T. Ng

We study the ground state of two-component bosonic atoms in a one-dimensional optical lattice. By applying an external field to the atoms at one end of lattice, the atoms are trans…