Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum error correction in multi-parameter quantum metrology
Wojciech Górecki, Sisi Zhou, Liang Jiang +1 more·Jan 3, 2019
We derive a necessary and sufficient condition for the possibility of preserving the Heisenberg scaling in general adaptive multi-parameter estimation schemes in presence of Markovian noise. In situations where the Heiseneberg scaling can be preserve...
Honeycomblike Phononic Networks of Spins with Closed Mechanical Subsystems
Xinzhu Li, M. Kuzyk, Hailin Wang·Jan 3, 2019
In a mechanical network of solid-state spins, spin qubits in adjacent mechanical resonators are coupled via vibrations. This nearest-neighbor (NN) mechanical coupling, however, can also lead to the formation of spectrally dense mechanical modes, with...
Improving solutions by embedding larger subproblems in a D-Wave quantum annealer
Shuntaro Okada, Masayuki Ohzeki, Masayoshi Terabe +1 more·Jan 2, 2019
Quantum annealing is a heuristic algorithm that solves combinatorial optimization problems, and D-Wave Systems Inc. has developed hardware implementation of this algorithm. However, in general, we cannot embed all the logical variables of a large-sca...
Faster quantum computation with permutations and resonant couplings
Yingkai Ouyang, Yi Shen, Lin Chen·Jan 2, 2019
Abstract Recently, there has been increasing interest in designing schemes for quantum computations that are robust against errors. Although considerable research has been devoted to quantum error correction schemes, much less attention has been paid...
Playing Quantum Monty Hall Game in a Quantum Computer
S. Paul, B. K. Behera, P. Panigrahi·Jan 1, 2019
Here, we present the quantum version of a very famous statistical decision problem, whose classical version is counter-intuitive to many. The Monty Hall game can be phrased as a two person game between Alice and Bob. In their pioneering work, Flitney...
Error corrected spin-state readout in a nanodiamond
Jeffrey Holzgrafe, Jan Beitner, D. Kara +2 more·Dec 31, 2018
Quantum state readout is a key component of quantum technologies, including applications in sensing, computation, and secure communication. Readout fidelity can be enhanced by repeating readouts. However, the number of repeated readouts is limited by...
Quantum-dot single-photon source on a CMOS silicon photonic chip integrated using transfer printing
R. Katsumi, Y. Ota, A. Osada +6 more·Dec 31, 2018
Silicon photonics is a powerful platform for implementing large-scale photonic integrated circuits (PICs), because of its compatibility with mature complementary-metal-oxide-semiconductor (CMOS) technology. Exploiting silicon-based PICs for quantum p...
Methodology for replacing indirect measurements with direct measurements
K. Mitarai, K. Fujii·Dec 31, 2018
In quantum computing, the indirect measurement of unitary operators such as the Hadamard test plays a significant role in many algorithms. However, in certain cases, the indirect measurement can be reduced to the direct measurement, where a quantum s...
Circuit optimization for IBM processors: A way to get higher fidelity and higher values of nonclassicality witnesses
M. Sisodia, A. Shukla, Alexandre A. A. de Almeida +2 more·Dec 30, 2018
Recently, various quantum computing and communication tasks have been implemented using IBM's superconductivity-based quantum computers which are available on the cloud. Here, we show that the circuits used in most of those works were not optimized a...
Ptychography of pure quantum states
M. F. Fernandes, Leonardo Neves·Dec 29, 2018
Ptychography is an imaging technique in which a localized illumination scans overlapping regions of an object and generates a set of diffraction intensities used to computationally reconstruct its complex-valued transmission function. We propose a qu...
Quantum computation with universal error mitigation on a superconducting quantum processor
Chao Song, Jingxin Cui, Haohua Wang +3 more·Dec 28, 2018
Probabilistic error cancellation is experimentally demonstrated on a superconducting quantum processor. Medium-scale quantum devices that integrate about hundreds of physical qubits are likely to be developed in the near future. However, these device...
An adaptive variational algorithm for exact molecular simulations on a quantum computer
Harper R. Grimsley, S. Economou, Edwin Barnes +1 more·Dec 28, 2018
Quantum simulation of chemical systems is one of the most promising near-term applications of quantum computers. The variational quantum eigensolver, a leading algorithm for molecular simulations on quantum hardware, has a serious limitation in that ...
Quantum approximate optimization is computationally universal
S. Lloyd·Dec 28, 2018
The quantum approximate optimization algorithm (QAOA) applies two Hamiltonians to a quantum system in alternation. The original goal of the algorithm was to drive the system close to the ground state of one of the Hamiltonians. This paper shows that ...
Entanglement entropy of Bell-network states in loop quantum gravity: Analytical and numerical results
Eugenio Bianchi, P. Donà, Ilya Vilensky·Dec 28, 2018
Bell-network states are loop-quantum-gravity states that glue quantum polyhedra with entanglement. We present an algorithm and a code that evaluates the reduced density matrix of a Bell-network state and computes its entanglement entropy. In particul...
Variational consistent histories as a hybrid algorithm for quantum foundations
A. Arrasmith, L. Cincio, A. Sornborger +2 more·Dec 27, 2018
Although quantum computers are predicted to have many commercial applications, less attention has been given to their potential for resolving foundational issues in quantum mechanics. Here we focus on quantum computers’ utility for the Consistent His...
Reinforcement learning architecture for automated quantum-adiabatic-algorithm design
Jian Lin, Z. Lai, Xiaopeng Li·Dec 27, 2018
Quantum algorithm design lies in the hallmark of applications of quantum computation and quantum simulation. Here we put forward a deep reinforcement learning (RL) architecture for automated algorithm design in the framework of quantum adiabatic algo...
Quantum Algorithm for Calculating Molecular Vibronic Spectra.
Nicolas P. D. Sawaya, J. Huh·Dec 26, 2018
We present a quantum algorithm for calculating the vibronic spectrum of a molecule, a useful but classically hard problem in chemistry. We show several advantages over previous quantum approaches: vibrational anharmonicity is naturally included; afte...
Box algorithm for the solution of differential equations on a quantum annealer
Siddharth Srivastava, V. Sundararaghavan·Dec 26, 2018
Differential equations are ubiquitous in models of physical phenomena. Applications like steady-state analysis of heat flow and deflection in elastic bars often admit to a second order differential equation. In this paper, we discuss the use of a qua...
Quantum Chemistry in the Age of Quantum Computing.
Yudong Cao, J. Romero, J. Olson +10 more·Dec 24, 2018
Practical challenges in simulating quantum systems on classical computers have been widely recognized in the quantum physics and quantum chemistry communities over the past century. Although many approximation methods have been introduced, the comple...
Quantum regularized least squares solver with parameter estimate
Changpeng Shao, Hua Xiang·Dec 24, 2018
For ill-conditioned least squares problems, regularization techniques such as Tikhonov regularization are the key ingredients to obtain meaningful solutions, and the determination of the proper regularization parameter is the most difficult step. Thi...