Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Detecting entanglement by pure bosonic extension
Xuanran Zhu, Chao Zhang, Chenfeng Cao +3 more·Sep 22, 2022
In the realm of quantum information theory, the detection and quantification of quantum entanglement stand as paramount tasks. The relative entropy of entanglement (REE) serves as a prominent measure of entanglement, with extensive applications spann...
Hybrid actor-critic algorithm for quantum reinforcement learning at CERN beam lines
M. Schenk, E. Combarro, M. Grossi +4 more·Sep 22, 2022
Free energy-based reinforcement learning (FERL) with clamped quantum Boltzmann machines (QBM) was shown to significantly improve the learning efficiency compared to classical Q-learning with the restriction, however, to discrete state-action space en...
Quantum algorithm for evaluating operator size with Bell measurements
Xi-Dan Hu, Tong Luo, Dan-Bo Zhang·Sep 22, 2022
Operator size growth describes the scrambling of operators in quantum dynamics and stands out as an essential physical concept for characterizing quantum chaos. Important as it is, a scheme for direct measuring operator size on a quantum computer is ...
Navigating the noise-depth tradeoff in adiabatic quantum circuits
Daniel Azses, M. Dupont, B. Evert +2 more·Sep 22, 2022
Adiabatic quantum algorithms solve computational problems by slowly evolving a trivial state to the desired solution. On an ideal quantum computer, the solution quality improves monotonically with increasing circuit depth. By contrast, increasing the...
Beyond Heisenberg Limit Quantum Metrology through Quantum Signal Processing
Yulong Dong, J. Gross, M. Niu·Sep 22, 2022
Leveraging quantum effects in metrology such as entanglement and coherence allows one to measure parameters with enhanced sensitivity [11]. However, time-dependent noise can disrupt such Heisenberg-limited amplification. We propose a quantum-metrolog...
A practical overview of image classification with variational tensor-network quantum circuits
Diego Guala, Shao-Fan Zhang, E. Cruz +3 more·Sep 22, 2022
Circuit design for quantum machine learning remains a formidable challenge. Inspired by the applications of tensor networks across different fields and their novel presence in the classical machine learning context, one proposed method to design vari...
Quantum circuit simulation of superchannels
Kai Wang, Dongsheng Wang·Sep 22, 2022
Quantum simulation is one of the central discipline to demonstrate the power of quantum computing. In recent years, the theoretical framework of quantum superchannels has been developed and applied widely as the extension of quantum channels. In this...
Complement Grover's Search Algorithm: An Amplitude Suppression Implementation
Andrew Vlasic, Salvatore Certo, Anh Pham·Sep 21, 2022
Grover's search algorithm was a groundbreaking advancement in quantum algorithms, providing a quadratic speedup of querying for items. Since the creation of this algorithm it has been utilized in various ways, including in preparing specific states f...
Iteration Complexity of Variational Quantum Algorithms
V. Kungurtsev, G. Korpas, Jakub Marecek +1 more·Sep 21, 2022
There has been much recent interest in near-term applications of quantum computers, i.e., using quantum circuits that have short decoherence times due to hardware limitations. Variational quantum algorithms (VQA), wherein an optimization algorithm im...
Learning Fourier series with parametrized quantum circuits
D. Heimann, Hans Hohenfeld, Gunnar Schönhoff +2 more·Sep 21, 2022
Variational quantum algorithms (VQAs) and their applications in the field of quantum machine learning through parametrized quantum circuits (PQCs) are thought to be one major way of leveraging noisy intermediate-scale quantum computing devices. Howev...
Infinite quantum signal processing
Yulong Dong, Lin Lin, Hongkang Ni +1 more·Sep 21, 2022
Quantum signal processing (QSP) represents a real scalar polynomial of degree d using a product of unitary matrices of size 2×2, parameterized by (d+1) real numbers called the phase factors. This innovative representation of polynomials has a wide ra...
TETRIS-ADAPT-VQE: An adaptive algorithm that yields shallower, denser circuit Ansätze
P. Anastasiou, Yanzhu Chen, N. Mayhall +2 more·Sep 21, 2022
Adaptive quantum variational algorithms are particularly promising for simulating strongly correlated systems on near-term quantum hardware, but they are not yet viable due, in large part, to the severe coherence time limitations on current devices. ...
Quantum algorithm for the microcanonical Thermal Pure Quantum method
Kaito Mizukami, A. Koga·Sep 21, 2022
We present a quantum algorithm for the microcanonical thermal pure quantum (TPQ) method, which has an advantage in evaluating thermodynamic quantities at finite temperatures, by combining with some recently developed techniques derived from quantum s...
Dimensionality Reduction with Variational Encoders Based on Subsystem Purification
R. Selvarajan, M. Sajjan, T. Humble +1 more·Sep 20, 2022
Efficient methods for encoding and compression are likely to pave the way toward the problem of efficient trainability on higher-dimensional Hilbert spaces, overcoming issues of barren plateaus. Here, we propose an alternative approach to variational...
Long-range data transmission in a fault-tolerant quantum bus architecture
Shin Ho Choe, R. Koenig·Sep 20, 2022
We propose a fault-tolerant scheme for generating long-range entanglement at the ends of a rectangular array of qubits of length R with a square cross-section of m=O(log2R)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepa...
Fast Ion Gates Outside the Lamb-Dicke Regime by Robust Quantum Optimal Control
Xiaodong Yang, Y. Lin, Yao Lu +1 more·Sep 20, 2022
We present a robust quantum optimal control framework for implementing fast entangling gates on ion-trap quantum processors. The framework leverages tailored laser pulses to drive the multiple vibrational sidebands of the ions to create phonon-mediat...
Wave Function Realization of a Thermal Collision Model
Uriel Shafir, R. Kosloff·Sep 20, 2022
An efficient algorithm to simulate dynamics of open quantum system is presented. The method describes the dynamics by unraveling stochastic wave functions converging to a density operator description. The stochastic techniques are based on the quantu...
Tunable spectral narrowing enabling the functionality of graphene qubit circuits at room temperature
S. Shafraniuk·Sep 20, 2022
Electrically controllable quantum coherence in quantum dot clusters and arrays based on graphene stripes with zigzag atomic edges (ZZ-stripes) is studied using the Dirac equation and S-matrix technique. We find that respective multiqubit circuits pro...
Radiative processes on a quantum computer
P. Bedaque, Ratna Khadka, G. Rupak +1 more·Sep 20, 2022
Radiative processes, where a photon/neutrino is emitted as a result of a collision or decay of a particle, play a central role in atomic, nuclear and particle physics. Their rate is determined by certain off-diagonal matrix elements with different in...
Parametric Synthesis of Computational Circuits for Complex Quantum Algorithms
C. B. Pronin, A. Ostroukh·Sep 20, 2022
At the moment, quantum circuits are created mainly by manually placing logic elements on lines that symbolize quantum bits. The purpose of creating Quantum Circuit Synthesizer"Naginata"was due to the fact that even with a slight increase in the numbe...