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Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Empirical Evaluation of Circuit Approximations on Noisy Quantum Devices
E. Wilson, F. Mueller, Lindsay Bassman +1 more·Jul 14, 2021
Noisy Intermediate-Scale Quantum (NISQ) devices fail to produce outputs with sufficient fidelity for deep circuits with many gates today. Such devices suffer from read-out, multi-qubit gate and cross-talk noise combined with short decoherence times l...
Simulation of the five-qubit quantum error correction code on superconducting qubits
I. A. Simakov, I. S. Besedin, A. V. Ustinov·Jul 14, 2021
Experimental realization of stabilizer-based quantum error correction (QEC) codes that would yield superior logical qubit performance is one of the formidable task for state-of-the-art quantum processors. A major obstacle towards realizing this goal ...
Full control of superconducting qubits with combined on-chip microwave and flux lines
R. Manenti, E. Sete, Angela Q. Chen +7 more·Jul 13, 2021
As the field of quantum computing progresses to larger-scale devices, multiplexing will be crucial to scale quantum processors. While multiplexed readout is common practice for superconducting devices, relatively little work has been reported about t...
An investigation of IBM quantum computing device performance on combinatorial optimisation problems
M. T. Khumalo, H. A. Chieza, K. Prag +1 more·Jul 8, 2021
The intractability of deterministic solutions in solving NP\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\o...
Polyadic braid operators and higher braiding gates
S. Duplij, R. Vogl·Jul 7, 2021
A new kind of quantum gates, higher braiding gates, as matrix solutions of the polyadic braid equations (different from the generalized Yang–Baxter equations) is introduced. Such gates lead to another special multiqubit entanglement that can speed up...
The two-qubit singlet/triplet measurement is universal for quantum computing given only maximally-mixed initial states
T. Rudolph, S. Virmani·Jul 7, 2021
In order to delineate which minimalistic physical primitives can enable the full power of universal quantum computing, it has been fruitful to consider various measurement based architectures which reduce or eliminate the use of coherent unitary evol...
Cost-efficient QFA Algorithm for Quantum Computers
Ozlem Salehi, A. Yakaryılmaz·Jul 5, 2021
. The study of quantum finite automata (QFAs) is one of the possible approaches in exploring quantum computers with finite memory. Despite being one of the most restricted models, Moore-Crutchfield quantum finite automaton (MCQFA) is proven to be exponen...
Reduced quantum circuits for stabilizer states and graph states
Marc Bataille·Jul 2, 2021
We start by studying the subgroup structures underlying stabilizer circuits and we use our results to propose a new normal form for stabilizer circuits. This normal form is computed by induction using simple conjugation rules in the Clifford group. I...
Quantum imaginary-time evolution algorithm for quantum field theories with continuous variables
Kubra Yeter-Aydeniz, Eleftherios Moschandreou, G. Siopsis·Jul 2, 2021
We calculate the energy levels and corresponding eigenstates of an interacting scalar quantum field theory on a lattice using a continuous-variable version of the quantum imaginary time evolution algorithm. Only a single qumode is needed for the simu...
QuantumSkynet: A High-Dimensional Quantum Computing Simulator
Andres Giraldo-Carvajal, Daniel A. Duque-Ramirez, J. Jaramillo-Villegas·Jun 30, 2021
The use of classical computers to simulate quantum computing has been successful in aiding the study of quantum algorithms and circuits that are too complex to examine analytically. Current implementations of quantum computing simulators are limited ...
Importance of Diagonal Gates in Tensor Network Simulations
Danylo Lykov, Y. Alexeev·Jun 29, 2021
In this work, we present two techniques that tremendously increase the performance of tensor-network based quantum circuit simulations. The techniques are implemented in the QTensor package and benchmarked using Quantum Approximate Optimization Algor...
Realizing coherently convertible dual-type qubits with the same ion species
H.-X. Yang, J.-Y. Ma, Y. Wu +7 more·Jun 28, 2021
Trapped ions constitute one of the most promising systems for implementing quantum computing and networking1,2. For large-scale ion-trap-based quantum computers and networks, it is critical to have two types of qubit: one for computation and storage,...
Optimal Control of Closed Quantum Systems via B-Splines with Carrier Waves
N. Petersson, Fortino Garcia·Jun 27, 2021
. We consider the optimal control problem of determining electromagnetic pulses for implementing logical gates in a closed quantum system, where the Hamiltonian models the dynamics of coupled superconducting qudits. The quantum state is governed by S...
Universal quantum circuits for quantum chemistry
J. Arrazola, O. D. Matteo, N. Quesada +3 more·Jun 25, 2021
Universal gate sets for quantum computing have been known for decades, yet no universal gate set has been proposed for particle-conserving unitaries, which are the operations of interest in quantum chemistry. In this work, we show that controlled sin...
Variational quantum algorithm for molecular geometry optimization
A. Delgado, J. Arrazola, S. Jahangiri +4 more·Jun 25, 2021
Classical algorithms for predicting the equilibrium geometry of strongly correlated molecules require expensive wave function methods that become impractical already for few-atom systems. In this work, we introduce a variational quantum algorithm for...
Efficient quantum simulation of open quantum system dynamics on noisy quantum computers
Shi-Ning Sun, Li-Chai Shih, Yuan‐Chung Cheng·Jun 24, 2021
Quantum simulation represents the most promising quantum application to demonstrate quantum advantage on near-term noisy intermediate-scale quantum (NISQ) computers, yet available quantum simulation algorithms are prone to errors and thus difficult t...
Learning Quantum Circuits of Some T Gates
C. Lai, Hao-Chung Cheng·Jun 23, 2021
In this paper, we study the problem of learning an unknown quantum circuit of a certain structure. If the unknown target is an <inline-formula> <tex-math notation="LaTeX">$n$ </tex-math></inline-formula>-qubit Clifford circuit, we devise an efficient...
Universal control of quantum processes using sector-preserving channels
Augustin Vanrietvelde, G. Chiribella·Jun 23, 2021
No quantum circuit can turn a completely unknown unitary gate into its coherently controlled version. Yet, coherent control of unknown gates has been realised in experiments, making use of a different type of initial resources. Here, we formalise the...
Quantum Simulation of Open Quantum Systems Using a Unitary Decomposition of Operators.
A. Schlimgen, Kade Head-Marsden, LeeAnn M. Sager +2 more·Jun 23, 2021
Electron transport in realistic physical and chemical systems often involves the nontrivial exchange of energy with a large environment, requiring the definition and treatment of open quantum systems. Because the time evolution of an open quantum sys...
Experimental Quantum Computing to Solve Network DC Power Flow Problem
R. Eskandarpour, Kumar Ghosh, A. Khodaei +1 more·Jun 22, 2021
Practical quantum computing applications to power grids are nonexistent at the moment. This paper investigates how a fundamental grid problem, namely DC power flow, can be solved using quantum computing. Power flow is the most widely used power syste...