Ancilla-entangling Floquet kicks for accelerating quantum algorithms

C. C.Joseph Wang, Phillip C. Lotshaw, Titus Morris, Vicente Leyton-Ortega, Daniel Claudino, Travis S. Humble

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum simulation with adiabatic annealing can provide insight into difficult problems that are impossible to study with classical computers. However, it deteriorates when the systems scale up due to the shrinkage of the excitation gap and thus places an annealing rate bottleneck for high success probability. Here, we accelerate quantum simulation using digital multiqubit gates that entangle primary system qubits with ancillary qubits. The practical benefits originate from tuning the ancillary gauge degrees of freedom to enhance the quantum algorithm's original functionality in the system registry. For simple but nontrivial short-ranged, infinite long-ranged transverse-field Ising models, and the hydrogen molecule model after qubit encoding, we show improvement in the time to solution by one hundred percent but with higher accuracy through exact state-vector numerical simulation in a digital-analog setting. The findings are further supported by time-averaged Hamiltonian theory.

Original languageEnglish
Article numberL010401
JournalPhysical Review A
Volume111
Issue number1
DOIs
StatePublished - Jan 2025

Fingerprint

Dive into the research topics of 'Ancilla-entangling Floquet kicks for accelerating quantum algorithms'. Together they form a unique fingerprint.

Cite this