Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Entanglement renormalization, quantum error correction, and bulk causality
Isaac H. Kim, M. Kastoryano·Dec 31, 2016
Entanglement renormalization can be viewed as an encoding circuit for a family of approximate quantum error correcting codes. The logical information becomes progres-sively more well-protected against erasure errors at larger length scales. In partic...
Construction of optimal resources for concatenated quantum protocols
A. Pirker, Julius Wallnofer, H. Briegel +1 more·Dec 30, 2016
We present a general framework for the explicit construction of resource states for measurement-based quantum information processing. In particular, we show how to obtain resource states of minimal size for complex tasks that are combinations or conc...
Fast microwave-driven three-qubit gates for cavity-coupled superconducting qubits
Edwin Barnes, C. Arenz, Alexander Pitchford +1 more·Dec 30, 2016
Although single and two-qubit gates are sufficient for universal quantum computation, single-shot three-qubit gates greatly simplify quantum error correction schemes and algorithms. We design fast, high-fidelity three-qubit entangling gates based on ...
Solutions to the mean king's problem: higher-dimensional quantum error-correcting codes
Masakazu Yoshida, Toru Kuriyama, Jun Cheng·Dec 27, 2016
Mean king's problem is a kind of quantum state discrimination problems. In the problem, we try to discriminate eigenstates of noncommutative observables with the help of classical delayed information. The problem has been investigated from the viewpo...
Properties of Unshunted and Resistively Shunted Nb/AlOx-Al/Nb Josephson Junctions With Critical Current Densities From 0.1 to 1 mA/μm2
S. K. Tolpygo, V. Bolkhovsky, S. Zarr +5 more·Dec 26, 2016
We investigated current–voltage characteristics of unshunted and externally shunted Josephson junctions (JJs) with high critical current densities <italic>J</italic><sub>c</sub> in order to extract their basic parameters and statistical characteristi...
Scalable Quantum Circuit and Control for a Superconducting Surface Code
R. Versluis, R. Versluis, S. Poletto +8 more·Dec 24, 2016
We present a scalable scheme for executing the error-correction cycle of a monolithic surface-code fabric composed of fast-flux-tunable transmon qubits with nearest-neighbor coupling. An eight-qubit unit cell forms the basis for repeating both the qu...
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...
Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature.
Gang-Qin Liu, Jian Xing, Wen-Long Ma +7 more·Dec 23, 2016
Single-shot readout of qubits is required for scalable quantum computing. Nuclear spins are superb quantum memories due to their long coherence time, but are difficult to be read out in a single shot due to their weak interaction with probes. Here we...
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 ...
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...
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 ...
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...
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...
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...
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...
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...
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...
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,...