Papers
Live trends in quantum computing research, updated daily from arXiv.
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Entanglement complexity of the Rokhsar-Kivelson-sign wavefunctions
Stefano Piemontese, T. Roscilde, A. Hamma·Nov 2, 2022
In this paper we study the transitions of entanglement complexity in an exemplary family of states - the Rokhsar-Kivelson-sign wavefunctions - whose degree of entanglement is controlled by a single parameter. This family of states is known to feature...
Faster variational quantum algorithms with quantum kernel-based surrogate models
Alistair W. R. Smith, A. Paige, Myungshik S. Kim·Nov 2, 2022
We present a new optimization strategy for small-to-intermediate scale variational quantum algorithms (VQAs) on noisy near-term quantum processors which uses a Gaussian process surrogate model equipped with a classically-evaluated quantum kernel. VQA...
Localizing genuine multiparty entanglement in noisy stabilizer states
Harikrishnan K. J., Amit Kumar Pal·Nov 2, 2022
Characterizing large noisy multiparty quantum states using genuine multiparty entanglement is a challenging task. In this paper, we calculate lower bounds of genuine multiparty entanglement localized over a chosen multiparty subsystem of multi-qubit ...
QuACK: Accelerating Gradient-Based Quantum Optimization with Koopman Operator Learning
Di Luo, Jiayu Shen, Rumen Dangovski +1 more·Nov 2, 2022
Quantum optimization, a key application of quantum computing, has traditionally been stymied by the linearly increasing complexity of gradient calculations with an increasing number of parameters. This work bridges the gap between Koopman operator th...
Quantum algorithms for classical Boolean functions via adaptive measurements: Exponential reductions in space-time resources
Austin K. Daniel, A. Miyake·Nov 2, 2022
The limited computational power of constant-depth quantum circuits can be boosted by adapting future gates according to the outcomes of mid-circuit measurements. We formulate computation of a variety of Boolean functions in the framework of adaptive ...
Derivation of a $\PT$-Symmetric Sine-Gordon Model from a Nonequilibrium Spin-Boson System via Keldysh Functional Integrals
Vinayak M. Kulkarni·Nov 1, 2022
We present a microscopic derivation from a nonequilibrium spin-boson model to a $\PT$-symmetric non-Hermitian sine-Gordon (SG) effective theory, via the Keldysh functional-integral formalism, a Lang-Firsov polaron transformation, bosonization, and a ...
Exploiting In-Constraint Energy in Constrained Variational Quantum Optimization
Tianyi Hao, Ruslan Shaydulin, Marco Pistoia +1 more·Nov 1, 2022
A central challenge of applying near-term quantum optimization algorithms to industrially relevant problems is the need to incorporate complex constraints. In general, such constraints cannot be easily encoded in the circuit, and the quantum circuit ...
Quantum Natural Gradient with Efficient Backtracking Line Search
Touheed Anwar Atif, U. Chukwu, Jesse Berwald +1 more·Nov 1, 2022
We consider the Quantum Natural Gradient Descent (QNGD) scheme which was recently proposed to train variational quantum algorithms. QNGD is Steepest Gradient Descent (SGD) operating on the complex projective space equipped with the Fubini-Study metri...
Time-optimal control of driven oscillators by variational circuit learning
Tangyou Huang, Yongcheng Ding, L. Dupays +4 more·Nov 1, 2022
The simulation of quantum dynamics on a digital quantum computer with parameterized circuits has widespread applications in fundamental and applied physics and chemistry. In this context, using the hybrid quantum-classical algorithm, combining classi...
Exploring Non-Linear Programming Formulations in QuantumCircuitOpt for Optimal Circuit Design
Elena R. Henderson, Harsha Nagarajan, Carleton Coffrin·Nov 1, 2022
Given the limitations of current hardware, the theoretical gains promised by quantum computing remain unre-alized across practical applications. But the gap between theory and hardware is closing, assisted by developments in quantum algorithmic model...
Quantum-inspired optimization for wavelength assignment
A. S. Boev, S. R. Usmanov, A. M. Semenov +5 more·Nov 1, 2022
Problems related to wavelength assignment (WA) in optical communications networks involve allocating transmission wavelengths for known transmission paths between nodes that minimize a certain objective function, for example, the total number of wave...
Universality of universal single-qubit-gate decomposition with coherent errors
Ruixia Wang, Peng Zhao, Haifeng Yu·Nov 1, 2022
To generate arbitrary one- and two-qubit gates, the universal decompositions are usually used in quantum computing, and the universality of these decompositions has been demonstrated. However, in realistic experiments, gate errors may affect the unive...
Rotation-inspired circuit cut optimization
G. Uchehara, T. Aamodt, Olivia Di Matteo·Nov 1, 2022
Recent works have demonstrated that large quantum circuits can be cut and decomposed into smaller clusters of quantum circuits with fewer qubits that can be executed independently on a small quantum computer. Classical post-processing then combines t...
Evaluation of Parameterized Quantum Circuits With Cross-Resonance Pulse-Driven Entanglers
Mohannad Ibrahim, Hamed Mohammadbagherpoor, Cynthia Rios +2 more·Nov 1, 2022
Variational quantum algorithms (VQAs) have emerged as a powerful class of algorithms that is highly suitable for noisy quantum devices. Therefore, investigating their design has become key in quantum computing research. Previous works have shown that...
Tierkreis: a Dataflow Framework for Hybrid Quantum-Classical Computing
Seyon Sivarajah, Lukas Heidemann, A. Lawrence +1 more·Nov 1, 2022
We present Tierkreis, a higher-order dataflow graph program representation and runtime designed for compositional, quantum-classical hybrid algorithms. The design of the system is motivated by the remote nature of quantum computers, the need for hybr...
Quantum Natural Language Generation on Near-Term Devices
Amin Karamlou, Marcel Pfaffhauser, James R. Wootton·Nov 1, 2022
The emergence of noisy medium-scale quantum devices has led to proof-of-concept applications for quantum computing in various domains. Examples include Natural Language Processing (NLP) where sentence classification experiments have been carried out,...
Charter: Identifying the Most-Critical Gate Operations in Quantum Circuits via Amplified Gate Reversibility
Tirthak Patel, Daniel Silver, Devesh Tiwari·Nov 1, 2022
When quantum programs are executed on noisy intermediate-scale quantum (NISQ) computers, they experience hardware noise; consequently, the program outputs are often erroneous. To mitigate the adverse effects of hardware noise, it is necessary to unde...
Automated Quantum Memory Compilation with Improved Dynamic Range
Aviraj Sinha, Elena R. Henderson, Jessie M. Henderson +1 more·Nov 1, 2022
Emerging quantum algorithms that process data require that classical input data be represented as a quantum state. These data-processing algorithms often follow the gate model of quantum computing-which requires qubits to be initialized to a basis st...
Modeling noise in global Mølmer-Sørensen interactions applied to quantum approximate optimization
Phillip C. Lotshaw, Kevin D. Battles, Bryan T. Gard +3 more·Oct 31, 2022
Many-qubit Molmer-Sorensen (MS) interactions applied to trapped ions offer unique capabilities for quantum information processing, with applications including quantum simulation and the quantum approximate optimization algorithm (QAOA). Here, we deve...
Accelerated quantum Monte Carlo with probabilistic computers
S. Chowdhury, Kerem Y Çamsarı, S. Datta·Oct 31, 2022
Quantum Monte Carlo (QMC) techniques are widely used in a variety of scientific problems and much work has been dedicated to developing optimized algorithms that can accelerate QMC on standard processors (CPU). With the advent of various special purp...