Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum nonlinear optics without photons
R. Stassi, V. Macrì, A. F. Kockum +4 more·Feb 2, 2017
Spontaneous parametric down-conversion is a well-known process in quantum nonlinear optics in which a photon incident on a nonlinear crystal spontaneously splits into two photons. Here we propose an analogous physical process where one excited atom d...
Quantum jumps, superpositions, and the continuous evolution of quantum states
R. Dick·Feb 1, 2017
Abstract The apparent dichotomy between quantum jumps on the one hand, and continuous time evolution according to wave equations on the other hand, provided a challenge to Bohr's proposal of quantum jumps in atoms. Furthermore, Schrodinger's time-dep...
Optimizing squeezing in a coherent quantum feedback network of optical parametric oscillators
C. Brif, M. Sarovar, D. Soh +2 more·Jan 16, 2017
Advances in the emerging field of coherent quantum feedback control (CQFC) have led to the development of new capabilities in the areas of quantum control and quantum engineering, with a particular impact on the theory and applications of quantum opt...
Engineering continuous and discrete variable quantum vortex states by nonlocal photon subtraction in a reconfigurable photonic chip
D. Barral, J. Liñares, Daniel Balado·Nov 1, 2016
We study the production of entangled two- and N-mode quantum states of light in optical waveguides. To this end, we propose a quantum photonic circuit that produces a reconfigurable superposition of photon subtraction on two single-mode squeezed stat...
Environmental noise effects on entanglement fidelity of exchange-coupled semiconductor spin qubits
R. Throckmorton, Edwin Barnes, S. Das Sarma·Oct 6, 2016
We investigate the effect of magnetic field and charge noise on the generation of entanglement between two Heisenberg exchange-coupled electron spins in a double quantum dot. We focus on exchange-driven evolution that would ideally take an initial un...
Measurement based quantum communication with resource states generated by entanglement purification
Julius Wallnofer, W. Dur·Sep 19, 2016
We investigate measurement-based quantum communication with noisy resource states that are generated by entanglement purification. We consider the transmission of encoded information via noisy quantum channels using a measurement-based implementation...
Giant photon gain in large-scale quantum dot-circuit QED systems
B. Agarwalla, M. Kulkarni, S. Mukamel +1 more·Jun 3, 2016
Author(s): Agarwalla, BK; Kulkarni, M; Mukamel, S; Segal, D | Abstract: © 2016 American Physical Society. Motivated by recent experiments on the generation of coherent light in engineered hybrid quantum systems, we investigate gain in a microwave pho...
High Visibility Time-Energy Entangled Photons from a Silicon Nanophotonic Chip
S. Rogers, D. Mulkey, Xiyuan Lu +2 more·May 20, 2016
Advances in quantum photonics have shown that chip-scale quantum devices are translating from the realm of basic research to applied technologies. Recent developments in integrated photonic circuits and single photon detectors indicate that the bottl...
A photon–photon quantum gate based on a single atom in an optical resonator
B. Hacker, S. Welte, G. Rempe +1 more·May 17, 2016
That two photons pass each other undisturbed in free space is ideal for the faithful transmission of information, but prohibits an interaction between the photons. Such an interaction is, however, required for a plethora of applications in optical qu...
Capacities of Quantum Amplifier Channels
H. Qi, M. Wilde·May 16, 2016
Quantum amplifier channels are at the core of several physical processes. Not only do they model the optical process of spontaneous parametric down-conversion, but the transformation corresponding to an amplifier channel also describes the physics of...
Real-time dynamics of lattice gauge theories with a few-qubit quantum computer
E. Martinez, C. Muschik, P. Schindler +8 more·May 15, 2016
Gauge theories are fundamental to our understanding of interactions between the elementary constituents of matter as mediated by gauge bosons. However, computing the real-time dynamics in gauge theories is a notorious challenge for classical computat...
A two-channel, spectrally degenerate polarization entangled source on chip
L. Sansoni, K. Luo, C. Eigner +4 more·Apr 12, 2016
Integrated optics provides the platform for the experimental implementation of highly complex and compact circuits for quantum information applications. In this context integrated waveguide sources represent a powerful resource for the generation of ...
Circuit design for multi-body interactions in superconducting quantum annealing systems with applications to a scalable architecture
N. Chancellor, S. Zohren, P. Warburton·Mar 31, 2016
Quantum annealing provides a way of solving optimization problems by encoding them as Ising spin models which are implemented using physical qubits. The solution of the optimization problem then corresponds to the ground state of the system. Quantum ...
Parametric down-conversion photon-pair source on a nanophotonic chip
Xiang Guo, Chang-ling Zou, C. Schuck +3 more·Mar 11, 2016
Quantum-photonic chips, which integrate quantum light sources alongside active and passive optical elements, as well as single-photon detectors, show great potential for photonic quantum information processing and quantum technology. Mature semicondu...
Photonic simulation of entanglement growth and engineering after a spin chain quench
I. Pitsios, L. Banchi, A. S. Rab +8 more·Mar 8, 2016
The time evolution of quantum many-body systems is one of the most important processes for benchmarking quantum simulators. The most curious feature of such dynamics is the growth of quantum entanglement to an amount proportional to the system size (...
Dynamical Lamb effect versus dissipation in superconducting quantum circuits
A. Zhukov, D. S. Shapiro, W. Pogosov +3 more·Mar 7, 2016
Superconducting circuits provide a new platform to study nonstationary cavity QED phenomena. An example of such a phenomenon is a dynamical Lamb effect which is a parametric excitation of an atom due to the nonadiabatic modulation of its Lamb shift. ...
Verified Compilation of Space-Efficient Reversible Circuits
M. Amy, M. Rötteler, K. Svore·Mar 4, 2016
The generation of reversible circuits from high-level code is an important problem in several application domains, including low-power electronics and quantum computing. Existing tools compile and optimize reversible circuits for various metrics, suc...
Co-designing a scalable quantum computer with trapped atomic ions
K. Brown, Jungsang Kim, C. Monroe·Feb 9, 2016
The first generation of quantum computers are on the horizon, fabricated from quantum hardware platforms that may soon be able to tackle certain tasks that cannot be performed or modelled with conventional computers. These quantum devices will not li...
Deterministic Single-Phonon Source Triggered by a Single Photon.
I. Söllner, L. Midolo, P. Lodahl·Feb 2, 2016
We propose a scheme that enables the deterministic generation of single phonons at gigahertz frequencies triggered by single photons in the near infrared. This process is mediated by a quantum dot embedded on chip in an optomechanical circuit, which ...
Superconducting qubit–oscillator circuit beyond the ultrastrong-coupling regime
F. Yoshihara, T. Fuse, S. Ashhab +3 more·Feb 1, 2016
A circuit that pairs a flux qubit with an LC oscillator via Josephson junctions pushes the coupling between light to matter to uncharted territory, with the potential for new applications in quantum technologies. The interaction between an atom and t...