Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Theoretical Evaluation of [VIV(α-C3S5)3]2- as Nuclear-Spin-Sensitive Single-Molecule Spin Transistor.
S. Cardona-Serra, A. Gaita-Ariño, M. Stamenova +1 more·Dec 23, 2016
In a straightforward application of molecular nanospintronics to quantum computing, single-molecule spin transistors can be used to measure nuclear spin qubits. Conductance jumps accompany electronic spin flips at the so-called anticrossings between ...
ProjectQ: An Open Source Software Framework for Quantum Computing
Damian S. Steiger, Thomas Häner, M. Troyer·Dec 23, 2016
We introduce ProjectQ, an open source software effort for quantum computing. The first release features a compiler framework capable of targeting various types of hardware, a high-performance simulator with emulation capabilities, and compiler plug-i...
Error tracing in linear and concatenated quantum circuits
Ritajit Majumdar, Saikat Basu, Priyanka Mukhopadhyay +1 more·Dec 23, 2016
Descriptions of quantum algorithms, communication etc. protocols assume the existence of closed quantum system. However, real life quantum systems are open and are highly sensitive to errors. Hence error correction is of utmost importance if quantum ...
Suppressing relaxation in superconducting qubits by quasiparticle pumping
S. Gustavsson, F. Yan, G. Catelani +15 more·Dec 23, 2016
Extending qubit lifetime through a shaped environment Qubits are the quantum two-level systems that encode and process information in quantum computing. Kept in isolation, qubits can be stable. In a practical setting, however, qubits must be addresse...
Robustness of quantum neural calculation increases with system size
N. Nguyen, E. Behrman, J. Steck·Dec 22, 2016
Noise and decoherence are two major obstacles to the implementation of large-scale quantum computing. Because of the no-cloning theorem, which says we cannot make an exact copy of an arbitrary quantum state, simple redundancy will not work in a quant...
Asynchronous Operations on Qubits in Distributed Simulation Environments using QooSim
J. J. vanBrandwijk, A. Parakh·Dec 22, 2016
Operations on a pair of entangled qubits are conventionally presented as the application of the tensor product of operations. The tensor product is linearly extended to act synchronously across the entire entangled system. When simulating an entangle...
A brief introduction to multipartite entanglement
I. Bengtsson, K. Życzkowski·Dec 22, 2016
A concise introduction to quantum entanglement in multipartite systems is presented. We review entanglement of pure quantum states of three--partite systems analyzing the classes of GHZ and W states and discussing the monogamy relations. Special atte...
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...
Long-time efficacy of the surface code in the presence of a super-Ohmic environment
D. A. L'opez-Delgado, E. Novais, E. Mucciolo +1 more·Dec 19, 2016
We study the long-time evolution of a quantum memory coupled to a bosonic environment on which quantum error correction (QEC) is performed using the surface code. The memory's evolution encompasses $N$ QEC cycles, each of them yielding a non-error sy...
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...
Non-Markovianity quantifier of an arbitrary quantum process
Tiago Debarba, F. Fanchini·Dec 14, 2016
Calculating the degree of non-Markovianity of a dissipative process is a difficult task, even for the dynamics of a single qubit, given the complex maximization problem. In this work, focusing on the entanglement-based quantifier of non-Markovianity,...
The surface code with a twist
Theodore J. Yoder, Isaac H. Kim·Dec 14, 2016
The surface code is one of the most successful approaches to topological quantum error-correction. It boasts the smallest known syndrome extraction circuits and correspondingly largest thresholds. Defect-based logical encodings of a new variety calle...
Modeling coherent errors in quantum error correction
D. Greenbaum, Z. Dutton·Dec 12, 2016
Analysis of quantum error correcting codes is typically done using a stochastic, Pauli channel error model for describing the noise on physical qubits. However, it was recently found that coherent errors (systematic rotations) on physical data qubits...
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...
Hard decoding algorithm for optimizing thresholds under general Markovian noise
C. Chamberland, Joel J. Wallman, Stefanie J. Beale +1 more·Dec 8, 2016
Quantum error correction is instrumental in protecting quantum systems from noise in quantum computing and communication settings. Pauli channels can be efficiently simulated and threshold values for Pauli error rates under a variety of error-correct...
Nonreciprocal Microwave Signal Processing with a Field-Programmable Josephson Amplifier.
F. Lecocq, L. Ranzani, G. Peterson +4 more·Dec 5, 2016
We report on the design and implementation of a field-programmable Josephson amplifier (FPJA)-a compact and lossless superconducting circuit that can be programmed in situ by a set of microwave drives to perform reciprocal and nonreciprocal frequency...
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...
Efficient Z gates for quantum computing
D. McKay, C. J. Wood, S. Sheldon +2 more·Dec 2, 2016
For superconducting qubits, microwave pulses drive rotations around the Bloch sphere. The phase of these drives can be used to generate zero-duration arbitrary virtual $Z$ gates, which, combined with two ${X}_{\ensuremath{\pi}/2}$ gates, can generate...