466 citations · 1.8k across the 19 of their papers we have counts for
20 papers
Efficient quantum measurement of Pauli operators in the presence of finite sampling error
Ophelia Crawford, Barnaby van Straaten, Daochen Wang +3
Estimating the expectation value of an operator corresponding to an observable is a fundamental task in quantum computation. It is often impossible to obtain such estimates directl…
Implementing smooth functions of a Hermitian matrix on a quantum computer
Sathyawageeswar Subramanian, Steve Brierley, Richard Jozsa
We review existing methods for implementing smooth functions f(A) of a sparse Hermitian matrix A on a quantum computer, and analyse a further combination of these techniques which…
Variational Quantum Computation of Excited States
Oscar Higgott, Daochen Wang, Stephen Brierley
The calculation of excited state energies of electronic structure Hamiltonians has many important applications, such as the calculation of optical spectra and reaction rates. While…
Accelerated Variational Quantum Eigensolver
Daochen Wang, Oscar Higgott, Stephen Brierley
The problem of finding the ground state energy of a Hamiltonian using a quantum computer is currently solved using either the quantum phase estimation (QPE) or variational quantum…
Convex separation from convex optimization for large-scale problems
Stephen Brierley, Miguel Navascues, Tamas Vertesi
We present a scheme, based on Gilbert's algorithm for quadratic minimization [SIAM J. Contrl., vol. 4, pp. 61-80, 1966], to prove separation between a point and an arbitrary convex…
Entanglement Detection with Fewer Measurements based on the Geometric Criterion
Bingjie Wang, Stephen Brierley
We present a new technique to reduce the expected number of measurements to declare an unknown quantum state as entangled. Our method is based on the geometric criterion and so req…