31 citations · 110 across the 18 of their papers we have counts for
19 papers
The classical homotopy category is cartesian closed
Zhen Lin Low
The category of all topological spaces and homotopy classes of maps is cartesian closed. In fact, the -category of all topological spaces and continuous maps, localise…
Quantum Vacuum Nonlinearities in Laser Interferometers
Zain Mehdi, Joseph J. Hope, Simon A. Haine
We propose all-optical tests of photon-photon interactions in the matter vacuum using standing-wave laser interferometers, which do not require external magnetic fields and use con…
Radial Fast Entangling Gates Under Micromotion in Trapped-Ion Quantum Computers
Phoebe Grosser, Monica Gutierrez Galan, Isabelle Savill-Brown +7
Micromotion in radio-frequency ion traps is generally considered detrimental for quantum logic gates, and is typically minimized in state-of-the-art experiments. However, as a dete…
Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors
Isabelle Savill-Brown, Zain Mehdi, Alexander K. Ratcliffe +5
Non-adiabatic two-qubit gate proposals for trapped-ion systems offer superior performance and flexibility over adiabatic schemes at the cost of increased laser control requirements…
Multi-mode cooling of a Bose-Einstein condensate with linear quantum feedback
Zain Mehdi, Matthew L. Goh, Matthew J. Blacker +2
We theoretically investigate measurement-based feedback control over the motional degrees of freedom of an oblate quasi-2D atomic Bose-Einstein condensate (BEC) subject to continuo…
Multimode feedback cooling of the collective modes of a Bose-Einstein condensate
Ryan J. Thomas, Jordan A. McMahon, Zain Mehdi +5
We experimentally demonstrate cavity-free feedback cooling of the three lowest-lying collective modes of a Bose-Einstein condensate in a prolate harmonic trap. Using shadowgraph im…
High-speed and high-connectivity two-qubit gates in long chains of trapped ions
Isabelle Savill-Brown, Joseph J. Hope, Alexander K. Ratcliffe +5
We present a theoretical study of fast all-to-all entangling gates in trapped-ion quantum processors, based on impulsive excitation of spin-dependent motion with broadband laser pu…
Fast mixed-species quantum logic gates for trapped-ion quantum networks
Zain Mehdi, Varun D. Vaidya, Isabelle Savill-Brown +6
Quantum logic operations between physically distinct qubits is an essential aspect of large-scale quantum information processing. We propose an approach to high-speed mixed-species…
Simulating Feedback Cooling of Incoherent Quantum Mixtures
Kaiwen Zhu, Zain Mehdi, Joseph J. Hope +1
We develop a new approach for efficient and scalable simulations of measurement and control of quantum systems built upon existing phase-space methods, namely the Truncated Wigner…
Dual Open Atom Interferometry for Compact and Mobile Quantum Sensing
Yosri Ben-Aïcha, Zain Mehdi, Christian Freier +12
We demonstrate an atom interferometer measurement protocol compatible with operation on a dynamic platform. Our method employs two open interferometers, derived from the same atomi…
Fundamental Limits of Feedback Cooling Ultracold Atomic Gases
Zain Mehdi, Simon A. Haine, Joseph J. Hope +1
We investigate the fundamental viability of cooling ultracold atomic gases with quantum feedback control. Our study shows that the trade-off between the resolution and destructiven…
Signatures of Quantum Gravity in the Gravitational Self-Interaction of Photons
Zain Mehdi, Joseph J. Hope, Simon A. Haine
We propose relativistic tests of quantum gravity using the gravitational self-interaction of photons in a cavity. We demonstrate that this interaction results in a number of quantu…
Feedback cooling Bose gases to quantum degeneracy
Matthew L. Goh, Zain Mehdi, Richard L. Taylor +5
Degenerate quantum gases are instrumental in advancing many-body quantum physics and underpin emerging precision sensing technologies. All state-of-the-art experiments use evaporat…
Mutual friction and diffusion of two-dimensional quantum vortices
Zain Mehdi, Joseph J. Hope, Stuart S. Szigeti +1
We present a microscopic open quantum systems theory of thermally-damped vortex motion in oblate atomic superfluids that includes previously neglected energy-damping interactions b…
Trap Frequency Measurement with a Pulsed Atom Laser
B. M. Henson, K. F. Thomas, Z. Mehdi +4
We describe a novel method of single-shot trap frequency measurement for a confined Bose-Einstein Condensate, which uses an atom laser to repeatedly sample the mean velocity of tra…
Superflow decay in a toroidal Bose gas: The effect of quantum and thermal fluctuations
Zain Mehdi, Ashton S. Bradley, Joseph J. Hope +1
We theoretically investigate the stochastic decay of persistent currents in a toroidal ultracold atomic superfluid caused by a perturbing barrier. Specifically, we perform detailed…
Scalable quantum computation with fast gates in two-dimensional microtrap arrays of trapped ions
Zain Mehdi, Alexander K. Ratcliffe, Joseph J. Hope
We theoretically investigate the use of fast pulsed two-qubit gates for trapped ion quantum computing in a two-dimensional microtrap architecture. In one dimension, such fast gates…
Fast entangling gates in long ion chains
Zain Mehdi, Alexander K. Ratcliffe, Joseph J. Hope
We present a model for implementing fast entangling gates (s) with ultra-fast pulses in arbitrarily long ion chains, that requires low numbers of pulses and can be imple…
Optimised fast gates for quantum computing with trapped ions
Evan P. G. Gale, Zain Mehdi, Lachlan M. Oberg +3
We present an efficient approach to optimising pulse sequences for implementing fast entangling two-qubit gates on trapped ion quantum information processors. We employ a two-phase…