122 citations · 659 across the 18 of their papers we have counts for
18 papers
Benchmarking Noisy Intermediate Scale Quantum Error Mitigation Strategies for Ground State Preparation of the HCl Molecule
Tim Weaving, Alexis Ralli, William M. Kirby +3
Due to numerous limitations including restrictive qubit topologies, short coherence times and prohibitively high noise floors, few quantum chemistry experiments performed on existi…
Exact and efficient Lanczos method on a quantum computer
William Kirby, Mario Motta, Antonio Mezzacapo
We present an algorithm that uses block encoding on a quantum computer to exactly construct a Krylov space, which can be used as the basis for the Lanczos method to estimate extrem…
Unitary Partitioning and the Contextual Subspace Variational Quantum Eigensolver
Alexis Ralli, Tim Weaving, Andrew Tranter +3
The contextual subspace variational quantum eigensolver (CS-VQE) is a hybrid quantum-classical algorithm that approximates the ground-state energy of a given qubit Hamiltonian. It…
A stabilizer framework for Contextual Subspace VQE and the noncontextual projection ansatz
Tim Weaving, Alexis Ralli, William M. Kirby +3
Quantum chemistry is a promising application for noisy intermediate-scale quantum (NISQ) devices. However, quantum computers have thus far not succeeded in providing solutions to p…
CAFQA: A classical simulation bootstrap for variational quantum algorithms
Gokul Subramanian Ravi, Pranav Gokhale, Yi Ding +7
This work tackles the problem of finding a good ansatz initialization for Variational Quantum Algorithms (VQAs), by proposing CAFQA, a Clifford Ansatz For Quantum Accuracy. The CAF…
Representation of the Fermionic Boundary Operator
Ismail Yunus Akhalwaya, Yang-Hui He, Lior Horesh +4
The boundary operator is a linear operator that acts on a collection of high-dimensional binary points (simplices) and maps them to their boundaries. This boundary map is one of th…
Second-quantized fermionic operators with polylogarithmic qubit and gate complexity
William Kirby, Bryce Fuller, Charles Hadfield +1
We present a method for encoding second-quantized fermionic systems in qubits when the number of fermions is conserved, as in the electronic structure problem. When the number …
Quantum Simulation of Second-Quantized Hamiltonians in Compact Encoding
William M. Kirby, Sultana Hadi, Michael Kreshchuk +1
We describe methods for simulating general second-quantized Hamiltonians using the compact encoding, in which qubit states encode only the occupied modes in physical occupation num…
Variational quantum eigensolvers for sparse Hamiltonians
William M. Kirby, Peter J. Love
Hybrid quantum-classical variational algorithms such as the variational quantum eigensolver (VQE) and the quantum approximate optimization algorithm (QAOA) are promising applicatio…
Simulating Hadronic Physics on NISQ devices using Basis Light-Front Quantization
Michael Kreshchuk, Shaoyang Jia, William M. Kirby +3
The analogy between quantum chemistry and light-front quantum field theory, first noted by Kenneth G. Wilson, serves as motivation to develop light-front quantum simulation of quan…
Consistency testing for robust phase estimation
Antonio E. Russo, William M. Kirby, Kenneth M. Rudinger +2
We present an extension to the robust phase estimation protocol, which can identify incorrect results that would otherwise lie outside the expected statistical range. Robust phase…
Contextual Subspace Variational Quantum Eigensolver
William M. Kirby, Andrew Tranter, Peter J. Love
We describe the contextual subspace variational quantum eigensolver (CS-VQE), a hybrid quantum-classical algorithm for approximating the ground state energy of a Hamiltonian. The a…
Light-Front Field Theory on Current Quantum Computers
Michael Kreshchuk, Shaoyang Jia, William M. Kirby +3
We present a quantum algorithm for simulation of quantum field theory in the light-front formulation and demonstrate how existing quantum devices can be used to study the structure…
Classical Simulation of Noncontextual Pauli Hamiltonians
William M. Kirby, Peter J. Love
Noncontextual Pauli Hamiltonians decompose into sets of Pauli terms to which joint values may be assigned without contradiction. We construct a quasi-quantized model for noncontext…
Quantum Simulation of Quantum Field Theory in the Light-Front Formulation
Michael Kreshchuk, William M. Kirby, Gary Goldstein +2
Quantum chromodynamics (QCD) describes the structure of hadrons such as the proton at a fundamental level. The precision of calculations in QCD limits the precision of the values o…
Measurement reduction in variational quantum algorithms
Andrew Zhao, Andrew Tranter, William M. Kirby +3
Variational quantum algorithms are promising applications of noisy intermediate-scale quantum (NISQ) computers. These algorithms consist of a number of separate prepare-and-measure…
Contextuality Test of the Nonclassicality of Variational Quantum Eigensolvers
William M. Kirby, Peter J. Love
Contextuality is an indicator of non-classicality, and a resource for various quantum procedures. In this paper, we use contextuality to evaluate the variational quantum eigensolve…
A Practical Quantum Algorithm for the Schur Transform
William M. Kirby, Frederick W. Strauch
We describe an efficient quantum algorithm for the quantum Schur transform. The Schur transform is an operation on a quantum computer that maps the standard computational basis to…