Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Fault-tolerant quantum error detection
N. Linke, Mauricio Gutiérrez, K. Landsman +4 more·Nov 21, 2016
We show the fault-tolerant encoding, measurement, and operation of a logical qubit via quantum error detection. Quantum computers will eventually reach a size at which quantum error correction becomes imperative. Quantum information can be protected ...
Living on the edge: a toy model for holographic reconstruction of algebras with centers
William Donnelly, D. Marolf, B. Michel +1 more·Nov 17, 2016
A bstractWe generalize the Pastawski-Yoshida-Harlow-Preskill (HaPPY) holographic quantum error-correcting code to provide a toy model for bulk gauge fields or linearized gravitons. The key new elements are the introduction of degrees of freedom on th...
Capacity estimation and verification of quantum channels with arbitrarily correlated errors
Corsin Pfister, M. A. Rol, A. Mantri +2 more·Nov 16, 2016
The central figure of merit for quantum memories and quantum communication devices is their capacity to store and transmit quantum information. Here, we present a protocol that estimates a lower bound on a channel’s quantum capacity, even when there ...
Symmetry-protected topological order at nonzero temperature
Sam Roberts, B. Yoshida, Aleksander Kubica +1 more·Nov 16, 2016
We address the question of whether symmetry-protected topological (SPT) order can persist at nonzero temperature, with a focus on understanding the thermal stability of several models studied in the theory of quantum computation. We present three res...
Error correction with orbital angular momentum of multiple photons propagating in a turbulent atmosphere
Jos'e Ra'ul Gonz'alez Alonso, T. Brun·Nov 12, 2016
Orbital angular momentum of photons is an intriguing system for the storage and transmission of quantum information, but it is rapidly degraded by atmospheric turbulence. Understanding the noise processes that affect photons is essential if we desire...
Quantum channel construction with circuit quantum electrodynamics
Chao Shen, Kyungjoo Noh, Victor V. Albert +5 more·Nov 10, 2016
Quantum channels can describe all transformations allowed by quantum mechanics. We provide an explicit universal protocol to construct all possible quantum channels, using a single qubit ancilla with quantum non-demolition readout and adaptive contro...
Note: Suppression of kHz-frequency switching noise in digital micro-mirror devices.
K. Hueck, A. Mazurenko, Niclas Luick +2 more·Nov 10, 2016
High resolution digital micro-mirror devices (DMDs) make it possible to produce nearly arbitrary light fields with high accuracy, reproducibility, and low optical aberrations. However, using these devices to trap and manipulate ultracold atomic syste...
Experimental demonstration of a fully inseparable quantum state with nonlocalizable entanglement
M. Mičuda, D. Koutný, M. Miková +3 more·Nov 8, 2016
Localizability of entanglement in fully inseparable states is a key ingredient of assisted quantum information protocols as well as measurement-based models of quantum computing. We investigate the existence of fully inseparable states with nonlocali...
Nonadiabatic corrections to fast dispersive multiqubit gates involving Z control
L. Theis, F. Wilhelm·Nov 8, 2016
We review a time-dependent version of the Schrieffer-Wolff transformation that accounts for real-time control of system parameters, soon to be rendered possible on a broad basis due to technical progress. The dispersive regime of N multilevel systems c...
Degeneracy-Preserving Quantum Nondemolition Measurement of Parity-Type Observables for Cat Qubits.
Joachim Cohen, W. C. Smith, M. Devoret +1 more·Nov 3, 2016
A central requirement for any quantum error correction scheme is the ability to perform quantum nondemolition measurements of an error syndrome, corresponding to a special symmetry property of the encoding scheme. It is in particular important that s...
Hybrid scheme for factorisation: Factoring 551 using a 3-qubit NMR quantum adiabatic processor
Soham Pal, Saranyo Moitra, V. S. Anjusha +2 more·Nov 3, 2016
Quantum processors are potentially superior to their classical counterparts for many computational tasks including factorisation. Circuit methods as well as adiabatic methods have already been proposed and implemented for finding the factors of a giv...
Model Dynamics for Quantum Computing
Frank Tabakin·Nov 2, 2016
A model master equation suitable for quantum computing dynamics is presented. In an ideal quantum computer (QC), a system of qubits evolves in time unitarily and, by virtue of their entanglement, interfere quantum mechanically to solve otherwise intr...
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...
Selective carrier injection into patterned arrays of pyramidal quantum dots for entangled photon light-emitting diodes
T. Chung, G. Juska, S. Moroni +3 more·Oct 31, 2016
Scalability and foundry compatibility (as apply to conventional silicon-based integrated computer processors, for example) in developing quantum technologies are major challenges facing current research. Here we introduce a quantum photonic technolog...
Quantum-annealing correction at finite temperature: Ferromagnetic p -spin models
S. Matsuura, H. Nishimori, W. Vinci +2 more·Oct 29, 2016
The performance of open-system quantum annealing is adversely affected by thermal excitations out of the ground state. While the presence of energy gaps between the ground and excited states suppresses such excitations, error correction techniques ar...
Cohomological invariants of Abelian symplectic quotients of pure $r$-qubits
S. Molladavoudi·Oct 28, 2016
In this paper, we study cohomology rings and cohomological pairings over Abelian symplectic quotients of special Hamiltonian tori manifolds. The Hamiltonian group actions appear in quantum information theory where the tori are maximal tori of some co...
Implementation of Traveling Odd Schrödinger Cat States in Circuit-QED
J. Joo, Su-Yong Lee, Jaewan Kim·Oct 27, 2016
We propose a realistic scheme of generating a traveling odd Schrodinger cat state and a generalized entangled coherent state in circuit quantum electrodynamics (circuit-QED). A squeezed vacuum state is used as the initial resource of nonclassical sta...
Implementation of pairwise longitudinal coupling in a three-qubit superconducting circuit
Tanay Roy, S. Kundu, M. Chand +7 more·Oct 25, 2016
We present the "trimon", a multi-mode superconducting circuit implementing three qubits with all-to-all longitudinal coupling. This always-on interaction enables simple implementation of generalized controlled-NOT gates which form a universal set. Fu...
Implementations of two-photon four-qubit Toffoli and Fredkin gates assisted by nitrogen-vacancy centers
Hai‐Rui Wei, Pei Zhu·Oct 24, 2016
It is desirable to implement an efficient quantum information process demanding fewer quantum resources. We designed two compact quantum circuits for determinately implementing four-qubit Toffoli and Fredkin gates on single-photon systems in both the...
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...