Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Observing pure effects of counter-rotating terms without ultrastrong coupling: A single photon can simultaneously excite two qubits
X. Wang, A. Miranowicz, Hong-rong Li +1 more·Sep 15, 2017
The coherent process that a single photon simultaneously excites two qubits has recently been theoretically predicted by [this https URL {Phys. Rev. Lett. 117, 043601 (2016)}]. We propose a different approach to observe a similar dynamical process ba...
Geometric phase corrections on a moving particle in front of a dielectric mirror
F. Lombardo, P. I. Villar·Jul 21, 2017
We consider an atom (represented by a two-level system) moving in front of a dielectric plate, and study how traces of dissipation and decoherence (both effects induced by vacuum field fluctuations) can be found in the corrections to the unitary geom...
Blueprint for fault-tolerant quantum computation with Rydberg atoms
J. Auger, S. Bergamini, D. Browne·Jul 20, 2017
We present a blueprint for building a fault-tolerant universal quantum computer with Rydberg atoms. Our scheme, which is based on the surface code, uses individually addressable, optically trapped atoms as qubits and exploits electromagnetically indu...
WavePacket: A Matlab package for numerical quantum dynamics.II: Open quantum systems, optimal control, and model reduction
B. Schmidt, C. Hartmann·Jul 19, 2017
Abstract WavePacket is an open-source program package for numeric simulations in quantum dynamics. It can solve time-independent or time-dependent linear Schrodinger and Liouville–von Neumann-equations in one or more dimensions. Also coupled equation...
Microwave photonics with superconducting quantum circuits
X. Gu, A. F. Kockum, A. Miranowicz +2 more·Jul 7, 2017
In the past 20 years, impressive progress has been made both experimentally and theoretically in superconducting quantum circuits, which provide a platform for manipulating microwave photons. This emerging field of superconducting quantum microwave c...
High-fidelity adiabatic quantum computation using the intrinsic Hamiltonian of a spin system: Application to the experimental factorization of 291311
Zhaokai Li, N. Dattani, Xi Chen +6 more·Jun 25, 2017
In previous implementations of adiabatic quantum algorithms using spin systems, the average Hamiltonian method with Trotter's formula was conventionally adopted to generate an effective instantaneous Hamiltonian that simulates an adiabatic passage. H...
Universal Quantum Computing with Measurement-Induced Continuous-Variable Gate Sequence in a Loop-Based Architecture.
S. Takeda, A. Furusawa·Jun 20, 2017
We propose a scalable scheme for optical quantum computing using measurement-induced continuous-variable quantum gates in a loop-based architecture. Here, time-bin-encoded quantum information in a single spatial mode is deterministically processed in...
Electromagnetically Induced Transparency in Circuit Quantum Electrodynamics with Nested Polariton States.
J. Long, H. Ku, Xian Wu +5 more·Apr 28, 2017
Quantum networks will enable extraordinary capabilities for communicating and processing quantum information. These networks require a reliable means of storage, retrieval, and manipulation of quantum states at the network nodes. A node receives one ...
Driving controlled entanglement in coupled flux qubits
A. Gramajo, D. Dom'inguez, M. J. S'anchez·Mar 16, 2017
We study the manipulation of quantum entanglement by periodic external fields. As an entanglement measure we compute numerically the concurrence of two flux qubits coupled inductively and/or capacitively, both driven by a dc+ac magnetic flux. Also we...
Complex Networks: from Classical to Quantum
J. Biamonte, Mauro Faccin, M. Domenico·Feb 27, 2017
Recent progress in applying complex network theory to problems faced in quantum information and computation has resulted in a beneficial crossover between two fields. Complex network methods have successfully been used to characterize quantum walk an...
Universal interrogation protocol with zero probe-field-induced frequency shift for quantum clocks and high-accuracy spectroscopy
T. Zanon-Willette, R. Lefevre, A. Taichenachev +1 more·Feb 21, 2017
Optical clock interrogation protocols, based on laser-pulse spectroscopy, are suffering from probe-induced frequency shifts and their variations induced by laser power. Original Hyper-Ramsey probing scheme, which was proposed to alleviate those issue...
Ultralow 1/f Noise in a Heterostructure of Superconducting Epitaxial Cobalt Disilicide Thin Film on Silicon.
S. Chiu, S. Yeh, Chien-Jyun Chiou +3 more·Jan 24, 2017
High-precision resistance noise measurements indicate that the epitaxial CoSi2/Si heterostructures at 150 and 2 K (slightly above its superconducting transition temperature Tc of 1.54 K) exhibit an unusually low 1/f noise level in the frequency range...
Dynamics of the quantum search and quench-induced first-order phase transitions.
Ivan B. Coulamy, A. Saguia, M. S. Sarandy·Jan 18, 2017
We investigate the excitation dynamics at a first-order quantum phase transition (QPT). More specifically, we consider the quench-induced QPT in the quantum search algorithm, which aims at finding out a marked element in an unstructured list. We begi...
Magnetic field sensing with quantum error detection under the effect of energy relaxation
Y. Matsuzaki, S. Benjamin·Nov 30, 2016
A solid state spin is an attractive system with which to realize an ultra-sensitive magnetic field sensor. A spin superposition state will acquire a phase induced by the target field, and we can estimate the field strength from this phase. Recent stu...
Circuit QED: cross-Kerr effect induced by a superconducting qutrit without classical pulses
Tongqi Liu, Yang Zhang, Bao-qing Guo +2 more·Nov 21, 2016
The realization of cross-Kerr nonlinearity is an important task for many applications in quantum information processing. In this work, we propose a method for realizing cross-Kerr nonlinearity interaction between two superconducting coplanar waveguid...
Mesoscopic fluctuations in biharmonically driven flux qubits
Alejandro Ferr'on Instituto de Modelado e Innovaci'on Tecnol'ogica, F. D. C. Exactas, Naturales y Agrimensura +6 more·Oct 24, 2016
We investigate flux qubits driven by a biharmonic magnetic signal, with a phase lag that acts as an effective time reversal broken parameter. The driving induced transition rate between the ground and the excited state of the flux qubit can be though...
Energy-efficient quantum computing
J. Ikonen, J. Salmilehto, M. Möttönen·Sep 9, 2016
In the near future, one of the major challenges in the realization of large-scale quantum computers operating at low temperatures is the management of harmful heat loads owing to thermal conduction of cabling and dissipation at cryogenic components. ...
Adiabatic transport of qubits around a black hole
David Viennot, Olivia Moro·Sep 6, 2016
We consider localized qubits evolving around a black hole following a quantum adiabatic dynamics. We develop a geometric structure (based on fibre bundles) permitting to describe the quantum states of a qubit and the spacetime geometry in a single fr...
Quantum dynamics of simultaneously measured non-commuting observables
S. Hacohen-Gourgy, Leigh S. Martin, E. Flurin +3 more·Aug 23, 2016
In quantum mechanics, measurements cause wavefunction collapse that yields precise outcomes, whereas for non-commuting observables such as position and momentum Heisenberg’s uncertainty principle limits the intrinsic precision of a state. Although th...
High-fidelity entangling gate for double-quantum-dot spin qubits
J. Nichol, L. Orona, S. Harvey +4 more·Aug 15, 2016
Electron spins in semiconductors are promising qubits because their long coherence times enable nearly 109 coherent quantum gate operations. However, developing a scalable high-fidelity two-qubit gate remains challenging. Here, we demonstrate an enta...