66 citations · 159 across the 15 of their papers we have counts for
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Reconstructing the phonon distribution of trapped ions out of the Lamb-Dicke regime
Christophe H. Valahu, Prachi Nagpal, Teerawat Chalermpusitarak +6
Characterizing the phonon distribution of trapped-ion motional states is essential for many applications in quantum information processing, but existing methods become ill-conditio…
Programmable quantum simulation of anharmonic dynamics
Cameron McGarry, Teerawat Chalermpusitarak, Kai Schwennicke +9
Continuous-variable-discrete-variable (CV-DV) quantum simulators offer a natural route to simulating bosonic dynamics relevant to many branches of physics and chemistry. However, p…
Optimal Displacement Sensing with Spin-Dependent Squeezed States
Liam J. Bond, Christophe H. Valahu, Athreya Shankar +2
Displacement sensing is a fundamental task in metrology. However, the development of quantum-enhanced sensors that fully utilize the available degrees of freedom in many-body quant…
Engineering continuous-variable entanglement in mechanical oscillators with optimal control
Maverick J. Millican, Vassili G. Matsos, Christophe H. Valahu +3
We demonstrate an optimal quantum control strategy for the deterministic preparation of entangled harmonic oscillator states in trapped ions. The protocol employs dynamical phase m…
Quantum-Enhanced Multi-Parameter Sensing in a Single Mode
Christophe H. Valahu, Matthew P. Stafford, Zixin Huang +7
Precision metrology underpins scientific and technological advancements. Quantum metrology offers a pathway to surpass classical sensing limits by leveraging quantum states and mea…
Universal Quantum Gate Set for Gottesman-Kitaev-Preskill Logical Qubits
V. G. Matsos, C. H. Valahu, M. J. Millican +4
The realisation of a universal quantum computer at scale promises to deliver a paradigm shift in information processing, providing the capability to solve problems that are intract…
Experimental Quantum Simulation of Chemical Dynamics
T. Navickas, R. J. MacDonell, C. H. Valahu +10
Accurate simulation of dynamical processes in molecules and reactions is among the most challenging problems in quantum chemistry. Quantum computers promise efficient chemical simu…
Simulating open-system molecular dynamics on analog quantum computers
V. C. Olaya-Agudelo, B. Stewart, C. H. Valahu +6
Interactions of molecules with their environment influence the course and outcome of almost all chemical reactions. However, classical computers struggle to accurately simulate com…
Ultrasensitive single-ion electrometry in a magnetic field gradient
F. Bonus, C. Knapp, C. H. Valahu +3
Hyperfine energy levels in trapped ions offer long-lived spin states. In addition, the motion of these charged particles couples strongly to external electric field perturbations.…
Benchmarking bosonic modes for quantum information with randomized displacements
Christophe H. Valahu, Tomas Navickas, Michael J. Biercuk +1
Bosonic modes are prevalent in all aspects of quantum information processing. However, existing tools for characterizing the quality, stability, and noise properties of bosonic mod…
Optimised Bayesian system identification in quantum devices
Thomas M. Stace, Jiayin Chen, Li Li +6
Identifying and calibrating quantitative dynamical models for physical quantum systems is important for a variety of applications. Here we present a closed-loop Bayesian learning a…
Direct observation of geometric phase in dynamics around a conical intersection
Christophe H. Valahu, Vanessa C. Olaya-Agudelo, Ryan J. MacDonell +9
Conical intersections are ubiquitous in chemistry and physics, often governing processes such as light harvesting, vision, photocatalysis, and chemical reactivity. They act as funn…
Predicting molecular vibronic spectra using time-domain analog quantum simulation
Ryan J. MacDonell, Tomas Navickas, Tim F. Wohlers-Reichel +8
Spectroscopy is one of the most accurate probes of the molecular world. However, predicting molecular spectra accurately is computationally difficult because of the presence of ent…
Quantum control methods for robust entanglement of trapped ions
Christophe H. Valahu, Iason Apostolatos, Sebastian Weidt +1
A major obstacle in the way of practical quantum computing is achieving scalable and robust high-fidelity entangling gates. To this end, quantum control has become an essential too…
Robust entanglement by continuous dynamical decoupling of the J-coupling interaction
C. H. Valahu, A. M. Lawrence, S. Weidt +1
We propose a laser-free entangling gate which uses the intrinsic J-coupling of ions in a static magnetic gradient. Dephasing of the interaction is suppressed by me…