Papers
Live trends in quantum computing research, updated daily from arXiv.
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15,666 papers in 12 months (-39% vs prior quarter)
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Forbidden subspaces for level-1 QAOA and IQP circuits
Michael Streif, M. Leib·Jul 24, 2020
We present a thorough investigation of problems that can be solved exactly with the level-1 Quantum Approximate Optimization Algorithm (QAOA). To this end we implicitly define a class of problem Hamiltonians that employed as phase separator in a leve...
ARC 3.0: An expanded Python toolbox for atomic physics calculations
E. J. Robertson, N. Šibalić, R. Potvliege +1 more·Jul 23, 2020
ARC 3.0 is a modular, object-oriented Python library combining data and algorithms to enable the calculation of a range of properties of alkali and divalent atoms. Building on the initial version of the ARC library [N. Sibalic et al, Comput. Phys. Co...
Quantum Go Machine
Lu-Feng Qiao, Jun Gao, Zhi-Qiang Jiao +9 more·Jul 23, 2020
Go has long been considered as a testbed for artificial intelligence. By introducing certain quantum features, such as superposition and collapse of wavefunction, we experimentally demonstrate a quantum version of Go by using correlated photon pair...
Quantum Differentially Private Sparse Regression Learning
Yuxuan Du, Min-Hsiu Hsieh, Tongliang Liu +2 more·Jul 23, 2020
The eligibility of various advanced quantum algorithms will be questioned if they can not guarantee privacy. To fill this knowledge gap, here we devise an efficient quantum differentially private (QDP) Lasso estimator to solve sparse regression tasks...
Speedup of the quantum adiabatic algorithm using delocalization catalysis
Chenfeng Cao, J. Xue, N. Shannon +1 more·Jul 22, 2020
We propose a method to speed up the quantum adiabatic algorithm using catalysis by many-body delocalization. This is applied to antiferromagnetic Heisenberg spin models. The algorithm is catalyzed in such a way that the evolution approximates such mo...
Improved Thermal Area Law and Quasilinear Time Algorithm for Quantum Gibbs States
Tomotaka Kuwahara, Álvaro M. Alhambra, Anurag Anshu·Jul 22, 2020
One of the most fundamental problems in quantum many-body physics is the characterization of correlations among thermal states. Of particular relevance is the thermal area law, which justifies the tensor network approximations to thermal states with ...
Nanoassembly technique of carbon nanotubes for hybrid circuit-QED
T. Cubaynes, L. Contamin, M. Dartiailh +4 more·Jul 22, 2020
A complex quantum dot circuit based on a clean and suspended carbon nanotube embedded in a circuit quantum electrodynamic (cQED) architecture is a very attractive platform to investigate a large spectrum of physics phenomena ranging from qubit physic...
The Rayleigh-Lorentz Invariant and Optimal Adiabatic Qubit-Information Detection for Superconducting Qubit Resonators
J. Choi·Jul 21, 2020
Dynamical properties of a resonator can be analyzed using the Rayleigh-Lorentz invariant which is not an exact constant but varies more or less over time. We investigate the time behavior of this invariant for a flux qubit resonator in order for bett...
Optimizing Quantum Search with a Binomial Version of Grover's Algorithm
Austin Gilliam, Marco Pistoia, Constantin Gonciulea·Jul 21, 2020
Amplitude Amplification -- a key component of Grover's Search algorithm -- uses an iterative approach to systematically increase the probability of one or multiple target states. We present novel strategies to enhance the amplification procedure by p...
Deep Variational Quantum Eigensolver: a divide-and-conquer method for solving a larger problem with smaller size quantum computers
K. Fujii, Kaoru Mizuta, H. Ueda +3 more·Jul 21, 2020
We propose a divide-and-conquer method for the quantum-classical hybrid algorithm to solve larger problems with small-scale quantum computers. Specifically, we concatenate variational quantum eigensolver (VQE) with reducing the dimensions of the syst...
Sufficient conditions and constraints for reversing general quantum errors
Alvin Gonzales, Daniel Dilley, M. Byrd·Jul 21, 2020
Reversing the effects of a quantum evolution, for example as is done in error correction, is an important task for controlling quantum systems in order to produce reliable quantum devices. When the evolution is governed by a completely positive map, ...
Quantum Algorithms for Escaping from Saddle Points
Chenyi Zhang, J. Leng, Tongyang Li·Jul 20, 2020
We initiate the study of quantum algorithms for escaping from saddle points with provable guarantee. Given a function f:Rn→R, our quantum algorithm outputs an ϵ-approximate second-order stationary point using O~(log2(n)/ϵ1.75) queries to the quantum...
Scalable Evaluation of Quantum-Circuit Error Loss Using Clifford Sampling.
Zhen Wang, Yanzhu Chen, Zixuan Song +6 more·Jul 20, 2020
A major challenge in developing quantum computing technologies is to accomplish high precision tasks by utilizing multiplex optimization approaches, on both the physical system and algorithm levels. Loss functions assessing the overall performance of...
Supervised Learning Using a Dressed Quantum Network with "Super Compressed Encoding": Algorithm and Quantum-Hardware-Based Implementation
Saurabh Kumar, Siddharth Dangwal, D. Bhowmik·Jul 20, 2020
Implementation of variational Quantum Machine Learning (QML) algorithms on Noisy Intermediate-Scale Quantum (NISQ) devices is known to have issues related to the high number of qubits needed and the noise associated with multi-qubit gates. In this pa...
A Generic Compilation Strategy for the Unitary Coupled Cluster Ansatz
Alexander Cowtan, Will Simmons, Ross Duncan·Jul 20, 2020
We describe a compilation strategy for Variational Quantum Eigensolver (VQE) algorithms which use the Unitary Coupled Cluster (UCC) ansatz, designed to reduce circuit depth and gate count. This is achieved by partitioning Pauli exponential terms into...
Limitations of Hartree-Fock with quantum resources.
Sahil Gulania, J. Whitfield·Jul 19, 2020
The Hartree-Fock problem provides the conceptual and mathematical underpinning of a large portion of quantum chemistry. As efforts in quantum technology aim to enhance computational chemistry algorithms, the Hartree-Fock method, central to many other...
Optimal verification of stabilizer states
Ninnat Dangniam, Yun-Guang Han, Huangjun Zhu·Jul 19, 2020
Statistical verification of a quantum state aims to certify whether a given unknown state is close to the target state with confidence. So far, sample-optimal verification protocols based on local measurements have been found only for disparate group...
Fault-tolerant measurement-free quantum error correction with multiqubit gates
M. Perlin, Vickram N. Premakumar, Jiakai Wang +2 more·Jul 19, 2020
Measurement-free quantum error correction (MFQEC) offers an alternative to standard measurement-based QEC in platforms with an unconditional qubit reset gate. We revisit the question of fault tolerance (FT) for a measurement-free variant of the Stean...
Evaluating Energy Differences on a Quantum Computer with Robust Phase Estimation.
A. Russo, K. Rudinger, B. Morrison +1 more·Jul 17, 2020
We adapt the robust phase estimation algorithm to the evaluation of energy differences between two eigenstates using a quantum computer. This approach does not require controlled unitaries between auxiliary and system registers or even a single auxil...
Quantum Computation of Fluid Dynamics
Sachin S. Bharadwaj, K. Sreenivasan·Jul 17, 2020
Studies of strongly nonlinear dynamical systems such as turbulent flows call for superior computational prowess. With the advent of quantum computing, a plethora of quantum algorithms have demonstrated, both theoretically and experimentally, more pow...