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...
Advanced Simulation of Quantum Computations
Alwin Zulehner, R. Wille·Jul 4, 2017
Quantum computation is a promising emerging technology which, compared to conventional computation, allows for substantial speed-ups, e.g., for integer factorization or database search. However, since physical realizations of quantum computers are in...
Continuous-variable quantum Gaussian process regression and quantum singular value decomposition of nonsparse low-rank matrices
Siddhartha Das, G. Siopsis, C. Weedbrook·Jul 2, 2017
With the significant advancement in quantum computation in the past couple of decades, the exploration of machine-learning subroutines using quantum strategies has become increasingly popular. Gaussian process regression is a widely used technique in...
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-...
Low-overhead code concatenation approaches for universal quantum computation
E. Nikahd, M. S. Zamani, M. Sedighi·Jul 1, 2017
Fault-tolerant quantum circuit design can be done by using a set of transversal gates. However, as there is no quantum error correction code with a universal set of transversal gates, several approaches have been proposed which, in combination of tra...
Towards visualisation of central-cell-effects in scanning tunnelling microscope images of subsurface dopant qubits in silicon.
M. Usman, B. Voisin, J. Salfi +2 more·Jun 30, 2017
Atomic-scale understanding of phosphorus donor wave functions underpins the design and optimisation of silicon based quantum devices. The accuracy of large-scale theoretical methods to compute donor wave functions is dependent on descriptions of cent...
Error rates and resource overheads of encoded three-qubit gates
Ryuji Takagi, Theodore J. Yoder, I. Chuang·Jun 30, 2017
A non-Clifford gate is required for universal quantum computation, and, typically, this is the most error-prone and resource intensive logical operation on an error-correcting code. Small, single-qubit rotations are popular choices for this non-Cliff...
Quantum computation with indefinite causal structures
Mateus Araújo, Philippe Allard Guérin, Ämin Baumeler·Jun 29, 2017
One way to study the physical plausibility of closed timelike curves (CTCs) is to examine their computational power. This has been done for Deutschian CTCs (D-CTCs) and postselection CTCs (P-CTCs), with the result that they allow for the efficient so...
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...
The Quantum Complexity of Computing Schatten $p$-norms
Chris Cade, A. Montanaro·Jun 28, 2017
We consider the quantum complexity of computing Schatten $p$-norms and related quantities, and find that the problem of estimating these quantities is closely related to the one clean qubit model of computation. We show that the problem of approximat...
Quantum algorithm for preparing the ground state of a system via resonance transition
Hefeng Wang·Jun 27, 2017
Preparing the ground state of a system is an important task in physics. We propose a quantum algorithm for preparing the ground state of a physical system that can be simulated on a quantum computer. The system is coupled to an ancillary qubit, by in...
Can Chaotic Quantum Circuits Maintain Quantum Supremacy under Noise
M. Yung, Xun Gao·Jun 27, 2017
Although the emergence of a fully-functional quantum computer may still be far away from today, in the near future, it is possible to have medium-size, special-purpose, quantum devices that can perform computational tasks not efficiently simulable wi...
Fast optimization algorithms and the cosmological constant
N. Bao, R. Bousso, S. Jordan +1 more·Jun 26, 2017
Denef and Douglas have observed that in certain landscape models the problem of finding small values of the cosmological constant is a large instance of a problem that is hard for the complexity class NP (Nondeterministic Polynomial-time). The number...
PhD thesis: Multipartite entanglement and quantum algorithms
Daniel Alsina·Jun 26, 2017
PhD thesis dealing with various aspects of multipartite entanglement, such as entanglement measures, absolutely maximally entangled states, bell inequalities, entanglement spectrum and quantum frustration. Also some quantum algorithms run with the IB...
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...
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...
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...
High-fidelity adiabatic quantum computation using the intrinsic Hamiltonian of a spin system: Application to the experimental factorization of 291311
Zhaokai Li, N. Dattani, Xi Chen +6 more·Jun 25, 2017
In previous implementations of adiabatic quantum algorithms using spin systems, the average Hamiltonian method with Trotter's formula was conventionally adopted to generate an effective instantaneous Hamiltonian that simulates an adiabatic passage. H...
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...