Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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...
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...
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...
Pulse sequences for suppressing leakage in single-qubit gate operations
J. Ghosh, S. Coppersmith, M. Friesen·Dec 2, 2016
Many realizations of solid-state qubits involve couplings to leakage states lying outside the computational subspace, posing a threat to high-fidelity quantum gate operations. Mitigating leakage errors is especially challenging when the coupling stre...
Magnetic field sensing with quantum error detection under the effect of energy relaxation
Y. Matsuzaki, S. Benjamin·Nov 30, 2016
A solid state spin is an attractive system with which to realize an ultra-sensitive magnetic field sensor. A spin superposition state will acquire a phase induced by the target field, and we can estimate the field strength from this phase. Recent stu...
Quantum State Transfer via Noisy Photonic and Phononic Waveguides.
B. Vermersch, P. Guimond, H. Pichler +1 more·Nov 30, 2016
We describe a quantum state transfer protocol, where a quantum state of photons stored in a first cavity can be faithfully transferred to a second distant cavity via an infinite 1D waveguide, while being immune to arbitrary noise (e.g., thermal noise...
Bound state properties of ABC-stacked trilayer graphene quantum dots
Haonan Xiong, Wentao Jiang, Yipu Song +1 more·Nov 28, 2016
The few-layer graphene quantum dot provides a promising platform for quantum computing with both spin and valley degrees of freedom. Gate-defined quantum dots in particular can avoid noise from edge disorders. In connection with the recent experiment...
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...
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...
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...
Verifiable fault tolerance in measurement-based quantum computation
K. Fujii, Masahito Hayashi·Oct 17, 2016
Quantum systems, in general, output data that cannot be simulated efficiently by a classical computer, and hence is useful for solving certain mathematical problems and simulating quantum many-body systems. This also implies, unfortunately, that veri...
Three addressable spin qubits in a molecular single-ion magnet
M. Jenkins, Yan Duan, B. Diosdado +6 more·Oct 13, 2016
We show that several qubits can be integrated in a single magnetic ion, using its internal electronic spin states with energies tuned by a suitably chosen molecular environment. This approach is illustrated with a nearly-isotropic Gd(III) ion entrapp...
Noise Threshold of Quantum Supremacy
K. Fujii·Oct 12, 2016
Demonstrating quantum supremacy, a complexity-guaranteed quantum advantage against over the best classical algorithms by using less universal quantum devices, is an important near-term milestone for quantum information processing. Here we develop a t...
Achieving quantum supremacy with sparse and noisy commuting quantum computations
M. Bremner, A. Montanaro, D. Shepherd·Oct 6, 2016
The class of commuting quantum circuits known as IQP (instantaneous quantum polynomial-time) has been shown to be hard to simulate classically, assuming certain complexity-theoretic conjectures. Here we study the power of IQP circuits in the presence...
Environmental noise effects on entanglement fidelity of exchange-coupled semiconductor spin qubits
R. Throckmorton, Edwin Barnes, S. Das Sarma·Oct 6, 2016
We investigate the effect of magnetic field and charge noise on the generation of entanglement between two Heisenberg exchange-coupled electron spins in a double quantum dot. We focus on exchange-driven evolution that would ideally take an initial un...
Nuclear numerical range and quantum error correction codes for non-unitary noise models
Patryk Lipka-Bartosik, K. Życzkowski·Oct 4, 2016
We introduce a notion of nuclear numerical range defined as the set of expectation values of a given operator A among normalized pure states, which belong to the nucleus of an auxiliary operator Z. This notion proves to be applicable to investigate m...
Fault-tolerant interface between quantum memories and quantum processors
Hendrik Poulsen Nautrup, N. Friis, H. Briegel·Sep 26, 2016
Topological error correction codes are promising candidates to protect quantum computations from the deteriorating effects of noise. While some codes provide high noise thresholds suitable for robust quantum memories, others allow straightforward gat...