166 citations · 845 across the 29 of their papers we have counts for
29 papers
Validation tests of GBS quantum computers give evidence for quantum advantage with a decoherent target
Alexander S. Dellios, Bogdan Opanchuk, Margaret D. Reid +1
Computational validation is vital for all large-scale quantum computers. One needs computers that are both fast and accurate. Here we apply precise, scalable, high order statistica…
Simulating macroscopic quantum correlations in linear networks
A. Dellios, Peter D. Drummond, Bogdan Opanchuk +2
Many developing quantum technologies make use of quantum networks of different types. Even linear quantum networks are nontrivial, as the output photon distributions can be exponen…
Simulating complex networks in phase space: Gaussian boson sampling
Peter D. Drummond, Bogdan Opanchuk, Alexander Dellios +1
We show how phase-space simulations of Gaussian quantum states in a photonic network permit verification of measurable correlations of Gaussian boson sampling (GBS) quantum compute…
The fate of the false vacuum: Finite temperature, entropy and topological phase in quantum simulations of the early universe
King Lun Ng, Bogdan Opanchuk, Manushan Thenabadu +2
Despite being at the heart of the theory of the "Big Bang" and cosmic inflation, the quantum field theory prediction of false vacuum tunneling has not been tested. To address the e…
Initial states and apodisation for quantum field simulations in phase-space
Peter D. Drummond
Bosonic quantum fields can be simulated with `quantum software' in phase-space. The positive-P, Wigner and Q-function phase-space methods are reviewed. Initial quantum states and b…
Nonlocal pair correlations in a higher-order Bose gas soliton
King Lun Ng, Bogdan Opanchuk, Margaret D. Reid +1
The truncated Wigner and positive-P phase-space representations are used to study the dynamics of a one-dimensional Bose gas. This allows calculations of the breathing quantum dyna…
Mesoscopic two-mode entangled and steerable states of 40,000 atoms in a Bose-Einstein condensate interferometer
B. Opanchuk, L. Rosales-Zárate, R. Y. Teh +4
Using criteria based on superselection rules, we analyze the quantum correlations between the two condensate modes of the Bose-Einstein condensate interferometer of Egorov et al. […
Phase-space representations of thermal Bose-Einstein condensates
King Ng, Rodney Polkinghorne, Bogdan Opanchuk +1
Phase-space methods allow one to go beyond the mean-field approximation to simulate the quantum dynamics of interacting fields. Here, we obtain a technique for initializing either…
Simulating and assessing boson sampling experiments with phase-space representations
Bogdan Opanchuk, Laura Rosales-Zarate, Margaret D Reid +1
The search for new, application-specific quantum computers designed to outperform any classical computer is driven by the ending of Moore's law and the quantum advantages potential…
Robustness of quantum Fourier transform interferometry
Bogdan Opanchuk, Laura Rosales-Zárate, Margaret D. Reid +1
We analyse the effect of decoherence and noise on quantum Fourier transform interferometry, in which a boson sampling photonic network is used to measure optical phase gradients. T…
One-dimensional Bose gas dynamics: breather relaxation
Bogdan Opanchuk, Peter D. Drummond
One-dimensional Bose gases are a useful testing-ground for quantum dynamics in many-body theory. They allow experimental tests of many-body theory predictions in an exponentially c…
Leggett-Garg tests of macro-realism for multi-particle systems including double-well Bose-Einstein condensates
L. Rosales-Zárate, B. Opanchuk, Q. Y. He +1
We construct quantifiable generalisations of Leggett-Garg tests for macro/ mesoscopic realism and noninvasive measurability that apply when not all outcomes of measurement can be i…
Quantum software for linear photonic simulations
B. Opanchuk, L. Rosales-Zárate, M. D. Reid +1
The search for new, application-specific quantum computers designed to outperform any classical computer is driven by the ending of Moore's law and the quantum advantages potential…
The universe on a table top: engineering quantum decay of a relativistic scalar field from a metastable vacuum
Oleksandr Fialko, Bogdan Opanchuk, Andrei I. Sidorov +2
The quantum decay of a relativistic scalar field from a metastable state ("false vacuum decay") is a fundamental idea in quantum field theory and cosmology. This occurs via local f…
The scaling of boson sampling experiments
Peter D. Drummond, Bogdan Opanchuk, Laura Rosales-Zárate +2
Boson sampling is the problem of generating a quantum bit stream whose average is the permanent of a matrix. The bitstream is created as the output of a prototype quant…
The sup-norm problem for GL(2) over number fields
Valentin Blomer, Gergely Harcos, Péter Maga +1
We solve the sup-norm problem for spherical Hecke-Maass newforms of square-free level for the group GL(2) over a number field, with a power saving over the local geometric bound si…
Parallel optimized sampling for stochastic equations
Bogdan Opanchuk, Simon Kiesewetter, Peter D. Drummond
Stochastic equations play an important role in computational science, due to their ability to treat a wide variety of complex statistical problems. However, current algorithms are…
Fate of the false vacuum: towards realization with ultra-cold atoms
O. Fialko, B. Opanchuk, A. I. Sidorov +2
Quantum decay of a relativistic scalar field from a false vacuum is a fundamental idea in quantum field theory. It is relevant to models of the early Universe, where the nucleation…
Quantum probabilistic sampling of multipartite 60-qubit Bell inequality violations
Margaret D. Reid, Bogdan Opanchuk, Laura Rosales-Zárate +1
We show that violation of genuine multipartite Bell inequalities can be obtained with sampled, probabilistic phase space methods. These genuine Bell violations cannot be replicated…
Probabilistic quantum phase-space simulation of Bell violations and their dynamical evolution
Laura Rosales-Zárate, Bogdan Opanchuk, Peter D. Drummond +1
Quantum simulations of Bell inequality violations are numerically obtained using probabilistic phase space methods, namely the positive P-representation. In this approach the momen…
Detecting faked continuous variable entanglement using one-sided device-independent entanglement witnesses
Bogdan Opanchuk, Ludovic Arnaud, Margaret D. Reid
We demonstrate the principle of one-sided device-independent continuous variable (CV) quantum information. In situations of no trust, we show by enactment how the use of standard C…
Simulating Bell violations without quantum computers
Peter D. Drummond, Bogdan Opanchuk, Laura Rosales-Zárate +1
We demonstrate that it is possible to simulate Bell violations using probabilistic methods. A quantum state corresponding to optical experiments that violate the Bell inequality is…
Quantum simulations of the early universe
Bogdan Opanchuk, Rodney Polkinghorne, Oleksandr Fialko +2
A procedure is described whereby a linearly coupled spinor Bose condensate can be used as a physically accessible quantum simulator of the early universe. In particular, an experim…
Probabilistic simulation of mesoscopic "Schrödinger cat" states
Bogdan Opanchuk, Laura Rosales-Zárate, Margaret D. Reid +1
We carry out probabilistic phase-space sampling of mesoscopic Schrödinger cat quantum states, demonstrating multipartite Bell violations for up to 60 qubits. We use states similar…