Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Freezing dynamics of genuine entanglement and loss of genuine nonlocality under collective dephasing
Mazhar N. Ali·Mar 29, 2017
We study the dynamics of genuine multipartite entanglement for quantum systems upto four qubits interacting with general collective dephasing process. Using a computable entanglement monotone for multipartite systems, we observe the feature of freezi...
Nonadaptive fault-tolerant verification of quantum supremacy with noise
Theodoros Kapourniotis, A. Datta·Mar 28, 2017
Quantum samplers are believed capable of sampling efficiently from distributions that are classically hard to sample from. We consider a sampler inspired by the classical Ising model. It is nonadaptive and therefore experimentally amenable. Under a p...
Error-Transparent Quantum Gates for Small Logical Qubit Architectures.
E. Kapit·Mar 28, 2017
One of the largest obstacles to building a quantum computer is gate error, where the physical evolution of the state of a qubit or group of qubits during a gate operation does not match the intended unitary transformation. Gate error stems from a com...
Depth-Optimal Quantum Circuit Placement for Arbitrary Topologies
Debjyoti Bhattacharjee, A. Chattopadhyay·Mar 24, 2017
A significant hurdle towards realization of practical and scalable quantum computing is to protect the quantum states from inherent noises during the computation. In physical implementation of quantum circuits, a long-distance interaction between two...
Tailored codes for small quantum memories
Alan Robertson, C. Granade, S. Bartlett +1 more·Mar 23, 2017
We demonstrate that small quantum memories, realized via quantum error correction in multi-qubit devices, can benefit substantially by choosing a quantum code that is tailored to the relevant error model of the system. For a biased noise model, with ...
Perfect sampling for quantum Gibbs states
Daniel Stilck França·Mar 16, 2017
We show how to obtain perfect samples from a quantum Gibbs state on a quantum computer. To do so, we adapt one of the `Coupling from the Past'-algorithms proposed by Propp and Wilson. The algorithm has a probabilistic run-time and produces perfect sa...
Robust quantum gates for stochastic time-varying noise
Chia-Hsien Huang, H. Goan·Mar 15, 2017
How to effectively construct robust quantum gates for time-varying noise is a very important but still outstanding problem. Here we develop a systematic method to find pulses for quantum gate operations robust against both low- and high-frequency (co...
Density-matrix simulation of small surface codes under current and projected experimental noise
T. O’Brien, B. Tarasinski, B. Tarasinski +1 more·Mar 12, 2017
We present a density-matrix simulation of the quantum memory and computing performance of the distance-3 logical qubit Surface-17, following a recently proposed quantum circuit and using experimental error parameters for transmon qubits in a planar c...
Efficient Simulation of Quantum Error Correction Under Coherent Error Based on the Nonunitary Free-Fermionic Formalism.
Yasunari Suzuki, K. Fujii, M. Koashi·Mar 10, 2017
In order to realize fault-tolerant quantum computation, a tight evaluation of the error threshold under practical noise models is essential. While non-Clifford noise is ubiquitous in experiments, the error threshold under non-Clifford noise cannot be...
Experimental Bayesian Quantum Phase Estimation on a Silicon Photonic Chip.
S. Paesani, A. A. Gentile, R. Santagati +5 more·Mar 7, 2017
Quantum phase estimation is a fundamental subroutine in many quantum algorithms, including Shor's factorization algorithm and quantum simulation. However, so far results have cast doubt on its practicability for near-term, nonfault tolerant, quantum ...
Dissipative quantum error correction and application to quantum sensing with trapped ions
F. Reiter, A. Sørensen, P. Zoller +1 more·Feb 28, 2017
Quantum-enhanced measurements hold the promise to improve high-precision sensing ranging from the definition of time standards to the determination of fundamental constants of nature. However, quantum sensors lose their sensitivity in the presence of...
Strong algorithmic cooling in large star-topology quantum registers
Varad R. Pande, Gaurav Bhole, Deepak Khurana +1 more·Feb 16, 2017
We envisage a star-topology quantum register, wherein a central computation qubit is symmetrically surrounded by a set of reset qubits. The reset qubits cool the computation qubit by transferring its entropy to a heat bath with the help of a heat-bat...
Dirac bi-spinor entanglement under local noise and its simulation by Jaynes-Cummings interactions
V. Bittencourt, A. Bernardini·Feb 13, 2017
A description of the effects of the local noise on the quantum entanglement constraining the internal degrees of freedom of Dirac bi-spinor structures driven by arbitrary Poincaré invariant potentials is proposed. Given that the Dirac equation dynami...
Schrödinger cat and Werner state disentanglement simulated by trapped ion systems
V. Bittencourt, A. Bernardini·Jan 30, 2017
Disentanglement and loss of quantum correlations due to one global collective noise effect are described for two-qubit Schrödinger cat and Werner states of a four level trapped ion quantum system. Once the Jaynes–Cummings ionic interactions are mappe...
Non-Abelian holonomic transformation in the presence of classical noise
J. Jing, C. Lam, L. -A. Wu·Jan 27, 2017
It is proposed that high-speed universal quantum gates can be realized by using non-Abelian holonomic transformation. A cyclic evolution path which brings the system periodically back to a degenerate qubit subspace is crucial to holonomic quantum com...
Ultralow 1/f Noise in a Heterostructure of Superconducting Epitaxial Cobalt Disilicide Thin Film on Silicon.
S. Chiu, S. Yeh, Chien-Jyun Chiou +3 more·Jan 24, 2017
High-precision resistance noise measurements indicate that the epitaxial CoSi2/Si heterostructures at 150 and 2 K (slightly above its superconducting transition temperature Tc of 1.54 K) exhibit an unusually low 1/f noise level in the frequency range...
Fast Reconstruction of High-qubit Quantum States via Low Rate Measurements
Kezhi Li, J. Zhang, S. Cong·Jan 13, 2017
Quantum state tomography is a fundamental technique for quantum technology, with many applications in quantum control and quantum communication. Due to the exponential complexity of the resources required for QST, people are looking for approaches th...
A dynamical interpretation of the Pauli Twirling Approximation and Quantum Error Correction
Amara Katabarwa·Jan 13, 2017
One of simplest and most widely used error model in working with quantum circuits is the Pauli Twirling Approximation (PTA). Restricting ourselves to analysis of free dynamics of qubits we show explicitly how application of PTA is equivalent to ignor...
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...