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20 papers · 2 filters
Implementation of Measurement Reduction for the Variational Quantum Eigensolver
Alexis Ralli, Peter Love, Andrew Tranter +1
One limitation of the variational quantum eigensolver algorithm is the large number of measurement steps required to estimate different terms in the Hamiltonian of interest. Unitar…
A converse to Lieb-Robinson bounds in one dimension using index theory
Daniel Ranard, Michael Walter, Freek Witteveen
Unitary dynamics with a strict causal cone (or "light cone") have been studied extensively, under the name of quantum cellular automata (QCAs). In particular, QCAs in one dimension…
Quantum algorithms for matrix scaling and matrix balancing
Joran van Apeldoorn, Sander Gribling, Yinan Li +3
Matrix scaling and matrix balancing are two basic linear-algebraic problems with a wide variety of applications, such as approximating the permanent, and pre-conditioning linear sy…
Matchgate benchmarking: Scalable benchmarking of a continuous family of many-qubit gates
Jonas Helsen, Sepehr Nezami, Matthew Reagor +1
We propose a method to reliably and efficiently extract the fidelity of many-qubit quantum circuits composed of continuously parametrized two-qubit gates called matchgates. This me…
A high-fidelity method for a single-step -bit Toffoli gate in trapped ions
Juan Diego Arias Espinoza, Koen Groenland, Matteo Mazzanti +2
Conditional multi-qubit gates are a key component for elaborate quantum algorithms. In a recent work, Rasmussen et al. (Phys. Rev. A 101, 022308) proposed an efficient single-step…
Fundamental limitations to key distillation from Gaussian states with Gaussian operations
Ludovico Lami, Ladislav Mišta, Gerardo Adesso
We establish fundamental upper bounds on the amount of secret key that can be extracted from quantum Gaussian states by using only local Gaussian operations, local classical proces…