Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Microwave photonics with superconducting quantum circuits
X. Gu, A. F. Kockum, A. Miranowicz +2 more·Jul 7, 2017
In the past 20 years, impressive progress has been made both experimentally and theoretically in superconducting quantum circuits, which provide a platform for manipulating microwave photons. This emerging field of superconducting quantum microwave c...
Efficient experimental design of high-fidelity three-qubit quantum gates via genetic programming
Amit Devra, Prithviraj Prabhu, Harpreet Singh +2 more·Jul 2, 2017
We have designed efficient quantum circuits for the three-qubit Toffoli (controlled–controlled-NOT) and the Fredkin (controlled-SWAP) gate, optimized via genetic programming methods. The gates thus obtained were experimentally implemented on a three-...
Approximate Quantum Error Correction Revisited: Introducing the Alpha-Bit
P. Hayden, Geoffrey Penington·Jun 28, 2017
We establish that, in an appropriate limit, qubits of communication should be regarded as composite resources, decomposing cleanly into independent correlation and transmission components. Because qubits of communication can establish ebits of entang...
Experimental Protection of the Spin Coherence of a Molecular Qubit Exceeding a Millisecond
Yingqiu Dai, Zhifu Shi, Yue Fu +9 more·Jun 28, 2017
There are several important solid-state systems, such as defects in solids, superconducting circuits and molecular qubits, for attractive candidates of quantum computations. Molecular qubits, which benefit from the power of chemistry for the tailored...
Arbitrarily exhaustive hypergraph generation of 4-, 6-, 8-, 16-, and 32-dimensional quantum contextual sets
M. Pavičić·Jun 26, 2017
Quantum contextuality turns out to be a necessary resource for universal quantum computation and important in the field of quantum information processing. It is therefore of interest both for theoretical considerations and for experimental implementa...
Circuit QED with qutrits: Coupling three or more atoms via virtual-photon exchange
Peng Zhao, Xinsheng Tan, Haifeng Yu +2 more·Jun 25, 2017
We present a model to describe a generic circuit QED system which consists of multiple artificial three-level atoms, namely qutrits, strongly coupled to a cavity mode. When the state transition of the atoms disobey the selection rules the process tha...
Efficient universal quantum channel simulation in IBM’s cloud quantum computer
Shijie Wei, T. Xin, G. Long·Jun 25, 2017
The study of quantum channels is an important field and promises a wide range of applications, because any physical process can be represented as a quantum channel that transforms an initial state into a final state. Inspired by the method of perform...
Preparation of Logically Labeled Pure States with Only Two Turns for Bulk Quantum Computation
T. Xin, Liang Hao, Shi-Yao Hou +2 more·Jun 25, 2017
Quantum state preparation plays an equally important role with quantum operations and measurements in quantum information processing. The previous methods of preparing initial state for bulk quantum computation all have inevitable disadvantages, such...
Universal Quantum Computing with Measurement-Induced Continuous-Variable Gate Sequence in a Loop-Based Architecture.
S. Takeda, A. Furusawa·Jun 20, 2017
We propose a scalable scheme for optical quantum computing using measurement-induced continuous-variable quantum gates in a loop-based architecture. Here, time-bin-encoded quantum information in a single spatial mode is deterministically processed in...
Millimeter-wave interconnects for microwave-frequency quantum machines
M. Pechal, A. Safavi-Naeini·Jun 16, 2017
Superconducting microwave circuits form a versatile platform for storing and manipulating quantum information. A major challenge to further scalability is to find approaches for connecting these systems over long distances and at high rates. One appr...
An argon ion beam milling process for native AlOx layers enabling coherent superconducting contacts
L. Grunhaupt, Uwe von Lupke, D. Gusenkova +8 more·Jun 16, 2017
We present an argon ion beam milling process to remove the native oxide layer forming on aluminum thin films due to their exposure to atmosphere in between lithographic steps. Our cleaning process is readily integrable with conventional fabrication o...
Fault-tolerance thresholds for the surface code with fabrication errors
J. Auger, H. Anwar, Mercedes Gimeno-Segovia +2 more·Jun 15, 2017
The construction of topological error correction codes requires the ability to fabricate a lattice of physical qubits embedded on a manifold with a non-trivial topology such that the quantum information is encoded in the global degrees of freedom (i....
Wavevector multiplexed atomic quantum memory via spatially-resolved single-photon detection
Michał Parniak, M. Dąbrowski, Mateusz Mazelanik +3 more·Jun 14, 2017
Parallelized quantum information processing requires tailored quantum memories to simultaneously handle multiple photons. The spatial degree of freedom is a promising candidate to facilitate such photonic multiplexing. Using a single-photon resolving...
3D integrated superconducting qubits
D. Rosenberg, David K. Kim, R. Das +12 more·Jun 13, 2017
As the field of quantum computing advances from the few-qubit stage to larger-scale processors, qubit addressability and extensibility will necessitate the use of 3D integration and packaging. While 3D integration is well-developed for commercial ele...
Experimental quantum verification in the presence of temporally correlated noise
S. Mavadia, C. Edmunds, Cornelius Hempel +4 more·Jun 12, 2017
Growth in the capabilities of quantum information hardware mandates access to techniques for performance verification that function under realistic laboratory conditions. Here we experimentally characterise the impact of common temporally correlated ...
Analog Quantum Error Correction with Encoding a Qubit into an Oscillator.
Kosuke Fukui, A. Tomita, A. Okamoto·Jun 9, 2017
To implement fault-tolerant quantum computation with continuous variables, Gottesman-Kitaev-Preskill (GKP) qubits have been recognized as an important technological element. However, the analog outcome of GKP qubits, which includes beneficial informa...
Integrated sources of photon quantum states based on nonlinear optics
L. Caspani, C. Xiong, B. Eggleton +5 more·Jun 6, 2017
The ability to generate complex optical photon states involving entanglement between multiple optical modes is not only critical to advancing our understanding of quantum mechanics but will play a key role in generating many applications in quantum t...
Structural properties of thin-film ferromagnetic topological insulators
C. C. Richardson, J. Devine-Stoneman, G. Divitini +6 more·Jun 6, 2017
We present a comprehensive study of the crystal structure of the thin-film, ferromagnetic topological insulator (Bi, Sb)2−xVxTe3. The dissipationless quantum anomalous Hall edge states it manifests are of particular interest for spintronics, as a nat...
Effect of unbalanced and common losses in quantum photonic integrated circuits
Ming Li, Chang-ling Zou, G. Guo +1 more·May 30, 2017
Loss is inevitable for the optical system due to absorption of materials, scattering caused by the defects and surface roughness. In quantum optical circuits, the loss can not only reduce the intensity of signal, but also affect the performance of qu...
Device-independent Point Estimation from Finite Data
Pei-Sheng Lin, D. Rosset, Yanbao Zhang +2 more·May 25, 2017
The device-independent approach to physics is one where conclusions are drawn directly from the observed correlations between measurement outcomes. In quantum information, this approach allows one to make strong statements about the properties of the...