869 citations · 4.6k across the 28 of their papers we have counts for
29 papers
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…
Scalable hyperfine qubit state detection via electron shelving in the D and F manifolds in Yb
C. L. Edmunds, T. R. Tan, A. R. Milne +3
Qubits encoded in hyperfine states of trapped ions are ideal for quantum computation given their long lifetimes and low sensitivity to magnetic fields, yet they suffer from off-res…
Precision Characterization of the D State and Quadratic Zeeman Coefficient in Yb
T. R. Tan, C. L. Edmunds, A. R. Milne +2
We report measurements of the branching fraction, hyperfine constant, and second-order Zeeman coefficient of the D level in Yb with up to two orders-of-magnitud…
Analog quantum simulation of chemical dynamics
Ryan J. MacDonell, Claire E. Dickerson, Clare J. T. Birch +5
Ultrafast chemical reactions are difficult to simulate because they involve entangled, many-body wavefunctions whose computational complexity grows rapidly with molecular size. In…
Quantum oscillator noise spectroscopy via displaced cat states
Alistair R. Milne, Cornelius Hempel, Li Li +5
Quantum harmonic oscillators are central to many modern quantum technologies. We introduce a method to determine the frequency noise spectrum of oscillator modes through coupling t…
Software tools for quantum control: Improving quantum computer performance through noise and error suppression
Harrison Ball, Michael J. Biercuk, Andre Carvalho +10
Manipulating quantum computing hardware in the presence of imperfect devices and control systems is a central challenge in realizing useful quantum computers. Susceptibility to noi…
Dynamically corrected gates suppress spatio-temporal error correlations as measured by randomized benchmarking
C. L. Edmunds, C. Hempel, R. J. Harris +3
Quantum error correction provides a path to large-scale quantum computers, but is built on challenging assumptions about the characteristics of the underlying errors. In particular…
Autonomous adaptive noise characterization in quantum computers
Riddhi Swaroop Gupta, Alistair R. Milne, Claire L. Edmunds +2
New quantum computing architectures consider integrating qubits as sensors to provide actionable information useful for decoherence mitigation on neighboring data qubits, but littl…
Environment-assisted quantum transport in a 10-qubit network
Christine Maier, Tiff Brydges, Petar Jurcevic +6
The way in which energy is transported through an interacting system governs fundamental properties in many areas of physics, chemistry, and biology. Remarkably, environmental nois…
Phase-modulated entangling gates robust to static and time-varying errors
Alistair R. Milne, Claire L. Edmunds, Cornelius Hempel +3
Entangling operations are among the most important primitive gates employed in quantum computing and it is crucial to ensure high-fidelity implementations as systems are scaled up.…
Quantum chemistry calculations on a trapped-ion quantum simulator
Cornelius Hempel, Christine Maier, Jonathan Romero +10
Quantum-classical hybrid algorithms are emerging as promising candidates for near-term practical applications of quantum information processors in a wide variety of fields ranging…
Measuring and Suppressing Error Correlations in Quantum Circuits
C. L. Edmunds, C. Hempel, R. Harris +4
Quantum error correction provides a path to large-scale quantum computers, but is built on challenging assumptions about the characteristics of the underlying errors. In particular…
Observation of Entangled States of a Fully Controlled 20-Qubit System
Nicolai Friis, Oliver Marty, Christine Maier +8
We generate and characterise entangled states of a register of 20 individually controlled qubits, where each qubit is encoded into the electronic state of a trapped atomic ion. Ent…
Experimental quantum verification in the presence of temporally correlated noise
S. Mavadia, C. L. Edmunds, C. Hempel +4
Growth in the complexity and capabilities of quantum information hardware mandates access to practical techniques for performance verification that function under realistic laborat…
Assessing the progress of trapped-ion processors towards fault-tolerant quantum computation
A. Bermudez, X. Xu, R. Nigmatullin +12
A quantitative assessment of the progress of small prototype quantum processors towards fault-tolerant quantum computation is a problem of current interest in experimental and theo…
Strategies for quantum computing molecular energies using the unitary coupled cluster ansatz
Jonathan Romero, Ryan Babbush, Jarrod R. McClean +3
The variational quantum eigensolver (VQE) algorithm combines the ability of quantum computers to efficiently compute expectation values with a classical optimization routine in ord…
Efficient tomography of a quantum many-body system
B. P. Lanyon, C. Maier, M. Holzäpfel +10
Quantum state tomography (QST) is the gold standard technique for obtaining an estimate for the state of small quantum systems in the laboratory. Its application to systems with mo…
Direct observation of dynamical quantum phase transitions in an interacting many-body system
P. Jurcevic, H. Shen, P. Hauke +7
Dynamical quantum phase transitions (DQPTs) extend the concept of phase transitions and thus universality to the non-equilibrium regime. In this letter, we investigate DQPTs in a s…
EIT ground-state cooling of long ion strings
R. Lechner, C. Maier, C. Hempel +6
Electromagnetically-induced-transparency (EIT) cooling is a ground-state cooling technique for trapped particles. EIT offers a broader cooling range in frequency space compared to…
Spectroscopy of interacting quasiparticles in trapped ions
P. Jurcevic, P. Hauke, C. Maier +4
The static and dynamic properties of many-body quantum systems are often well described by collective excitations, known as quasiparticles. Engineered quantum systems offer the opp…
Observation of entanglement propagation in a quantum many-body system
P. Jurcevic, B. P. Lanyon, P. Hauke +4
The key to explaining a wide range of quantum phenomena is understanding how entanglement propagates around many-body systems. Furthermore, the controlled distribution of entanglem…
Experimental violation of multipartite Bell inequalities with trapped ions
B. P. Lanyon, M. Zwerger, P. Jurcevic +5
We report on the experimental violation of multipartite Bell inequalities by entangled states of trapped ions. First we consider resource states for measurement-based quantum compu…
Measurement-based quantum computation with trapped ions
B. P. Lanyon, P. Jurcevic, M. Zwerger +6
Measurement-based quantum computation (MBQC) represents a powerful and flexible framework for quantum information processing, based on the notion of entangled quantum states as com…