Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Incoherent-mediator for quantum state transfer in the ultrastrong coupling regime
F. A. Cárdenas-López, F. Albarrán-Arriagada, G. A. Barrios +2 more·Dec 20, 2016
We study quantum state transfer between two qubits coupled to a common quantum bus that is constituted by an ultrastrong coupled light-matter system. By tuning both qubit frequencies on resonance with a forbidden transition in the mediating system, w...
In-situ Adaptive Encoding for Asymmetric Quantum Error Correcting Codes
Jan Florjanczyk, T. Brun·Dec 17, 2016
We present techniques that improve the performance of asymmetric stabilizer codes in the presence of unital channels with unknown parameters. Our method estimates the channel parameters using information recovered from syndrome measurements during st...
High-dimensional intracity quantum cryptography with structured photons
Alicia Sit, F. Bouchard, R. Fickler +11 more·Dec 15, 2016
Quantum key distribution (QKD) promises information-theoretically secure communication and is already on the verge of commercialization. The next step will be to implement high-dimensional protocols in order to improve noise resistance and increase t...
Causal Structures and the Classification of Higher Order Quantum Computations
P. Perinotti·Dec 15, 2016
Quantum operations are the most widely used tool in the theory of quantum information processing, representing elementary transformations of quantum states that are composed to form complex quantum circuits. The class of quantum transformations can b...
Quantum Dynamical Entropy, Chaotic Unitaries and Complex Hadamard Matrices
Wojciech Słomczyński, Anna Szczepanek·Dec 11, 2016
We introduce two information-theoretical invariants for the projective unitary group acting on a finite-dimensional complex Hilbert space: PVM- and POVM-dynamical (quantum) entropies, which are analogues of the classical Kolmogorov-Sinai entropy rate...
A single-state semi-quantum key distribution protocol and its security proof
Wei Zhang, Daowen Qiu·Dec 3, 2016
Semi-quantum key distribution (SQKD) can share secret keys by using less quantum resource than its fully quantum counterparts, and this likely makes SQKD become more practical and realizable. In this paper, we present a new SQKD protocol by introduci...
Towards Holography via Quantum Source-Channel Codes.
F. Pastawski, J. Eisert, H. Wilming·Nov 22, 2016
While originally motivated by quantum computation, quantum error correction (QEC) is currently providing valuable insights into many-body quantum physics, such as topological phases of matter. Furthermore, mounting evidence originating from holograph...
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 ...
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...
Superradiance with an ensemble of superconducting flux qubits
Neill Lambert, Y. Matsuzaki, K. Kakuyanagi +3 more·Nov 21, 2016
Superconducting flux qubits are a promising candidate for realizing quantum information processing and quantum simulations. Such devices behave like artificial atoms, with the advantage that one can easily tune the ``atoms'' internal properties. Here...
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 ...
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...
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...
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...
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...
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...
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...