Papers

Yao Ma, M. Pang, Libo Chen +1 more·Jul 25, 2018

Quantum-enhanced parameter estimation has widespread applications in many fields. An important issue is to protect the estimation precision against the noise-induced decoherence. Here we develop a general theoretical framework for improving the preci...

R. Hussain, G. Allodi, A. Chiesa +7 more·Jul 24, 2018

We demonstrate that the [Yb(trensal)] molecule is a prototypical coupled electronic qubit-nuclear qudit system. The combination of noise-resilient nuclear degrees of freedom and large reduction of nutation time induced by electron-nuclear mixing enab...

K. Landsman, C. Figgatt, T. Schuster +4 more·Jun 7, 2018

Quantum scrambling is the dispersal of local information into many-body quantum entanglements and correlations distributed throughout an entire system. This concept accompanies the dynamics of thermalization in closed quantum systems, and has recentl...

Christina Knapp, M. Beverland, D. Pikulin +1 more·Jun 4, 2018

Majorana-based quantum computing seeks to use the non-local nature of Majorana zero modes to store and manipulate quantum information in a topologically protected way. While noise is anticipated to be significantly suppressed in such systems, finite ...

L. Bourdet, L. Hutin, B. Bertrand +14 more·Jun 1, 2018

We fabricated quantum dot devices using a standard SOI CMOS process flow and demonstrated that the spin of confined electrons could be controlled via a local electrical-field excitation, owing to intervalley spin–orbit coupling. We discuss that modul...

Xiao-tong Yu, Qi Zhang, Y. Ban +1 more·May 16, 2018

Rapid preparation, manipulation, and correction of spin states with high fidelity are requisite for quantum information processing and quantum computing. In this paper, we propose a fast and robust approach for controlling two spins with Heisenberg a...

Panjin Kim, Daewan Han, K. Jeong·May 15, 2018

Performance of cryptanalytic quantum search algorithms is mainly inferred from query complexity which hides overhead induced by an implementation. To shed light on quantitative complexity analysis removing hidden factors, we provide a framework for e...

Linran Fan, Chang-ling Zou, Risheng Cheng +5 more·May 11, 2018

Electro-optical chips promise a quantum link between electronic and optical circuits. Leveraging the quantum information-processing ability of superconducting circuits and long-distance distribution ability of optical photons promises the realization...

K. Fujikawa, C. Oh, Koichiro Umetsu·Apr 26, 2018

A new approach to the classical limit of Grover’s algorithm is discussed by assuming a very rapid dephasing of a system between consecutive Grover’s unitary operations, which drives pure quantum states to decohered mixed states. One can identify a sp...

L. Arrachea, Rosa López·Mar 27, 2018

We formulate a general theory to study the time-dependent charge and energy transport of an adiabatically driven quantum dot in contact to normal and superconducting reservoirs at T = 0. This setup is a generalization of a quantum RC circuit, with ca...

Vahid Azimi Mousolou, E. Sjöqvist·Mar 1, 2018

Entanglement is one of the main resources of quantum computation, and entangling power of a quantum system is a crucial element in the universality and efficiency of a proposed architecture for realization of quantum processing. Our goal here is to s...

Hao Zhang, A. Alsaedi, T. Hayat +1 more·Mar 1, 2018

We present a theoretical proposal for a physical implementation of entanglement concentration and purification protocols for two-mode squeezed microwave photons in circuit quantum electrodynamics (QED). First, we give the description of the cross-Ker...

Donovan Buterakos, R. Throckmorton, S. Das Sarma·Feb 22, 2018

We present a scheme for correcting for crosstalk- and noise-induced errors in exchange-coupled singlet-triplet semiconductor double quantum dot qubits. While exchange coupling allows the coupling strength to be controlled independently of the intraqu...

J. Maire, G. Arregui, N. Capuj +5 more·Feb 4, 2018

Optomechanical (OM) structures are well suited to study photon-phonon interactions, and they also turn out to be potential building blocks for phononic circuits and quantum computing. In phononic circuits, in which information is carried and processe...

N. Sundaresan, Rex Lundgren, Guanyu Zhu +2 more·Jan 30, 2018

Qubits strongly coupled to a photonic crystal give rise to qubit-photon dressed bound states. These bound states, comprising the qubits and spatially localized photonic modes induced around the qubits, are the basis for many exotic physical scenarios...

P. Magnard, P. Kurpiers, B. Royer +8 more·Jan 23, 2018

Active qubit reset is a key operation in many quantum algorithms, and particularly in quantum error correction. Here, we experimentally demonstrate a reset scheme for a three-level transmon artificial atom coupled to a large bandwidth resonator. The ...

R. Hartle, C. Schinabeck, M. Kulkarni +3 more·Jan 22, 2018

We demonstrate the possiblity to cool nanoelectronic systems in nonequilibrium situations by increasing the temperature of the environment. Such cooling by heating is possible for a variety of experimental conditions where the relevant transport-indu...

Josephine Dias, T. Ralph·Dec 6, 2017

Gaussian noise induced by loss on Gaussian states may be corrected by distributing Einstein-Podolsky-Rosen entanglement through the loss channel, purifying the entanglement using a noiseless linear amplifier (NLA), and then using it for continuous-va...

Ruoyu Li, L. Petit, D. P. Franke +10 more·Nov 10, 2017

Quantum dots take a shortcut toward practical quantum information. The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-fide...

I. Bardet·Oct 3, 2017

We generalize the notions of the non-commutative Poincar\'e and modified log-Sobolev inequalities for primitive quantum Markov semigroups (QMS) to not necessarily primitive ones. These two inequalities provide estimates on the decoherence time of the...