A5026157248- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
- Quantum Mechanics and Applications
- Advanced Frequency and Time Standards
- Atomic and Molecular Physics
- Quantum-Dot Cellular Automata
- Diamond and Carbon-based Materials Research
- Advancements in Semiconductor Devices and Circuit Design
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Low-power high-performance VLSI design
- Cold Atom Physics and Bose-Einstein Condensates
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Magnetic confinement fusion research
- Advanced Electrical Measurement Techniques
- Photonic Crystal and Fiber Optics
- Scheduling and Optimization Algorithms
- Spectroscopy and Quantum Chemical Studies
- Physics of Superconductivity and Magnetism
- Advanced Fiber Optic Sensors
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
The University of Sydney
2013-2021
Queensland Rail
2021
ARC Centre of Excellence for Engineered Quantum Systems
2013-2021
Q-Flex (United States)
2021
National Measurement Institute
2013-2016
Effectively manipulating quantum computing hardware in the presence of imperfect devices and control systems is a central challenge realizing useful computers.Susceptibility to noise critically limits performance capabilities today's so-called noisy intermediate-scale (NISQ) devices, as well any future technologies.Fortunately, enables efficient execution logic operations algorithms with builtin robustness errors, without need for complex logical encoding.In this manuscript we introduce...
Abstract Experimentalists seeking to improve the coherent lifetimes of quantum bits have generally focused on mitigating decoherence mechanisms through, for example, improvements qubit designs and materials, system isolation from environmental perturbations. In case phase degree freedom in a superposition, however, coherence that must be preserved is not solely internal qubit, but rather necessarily includes relative ‘master clock’ (e.g., local oscillator) governs its control system. this...
Among the most popular and well-studied quantum characterization, verification, validation techniques is randomized benchmarking (RB), an important statistical tool used to characterize performance of physical logic operations useful in information processing. In this work we provide a detailed mathematical treatment effect temporal noise correlations on outcomes RB protocols. We fully analytic framework capturing accumulation error expressed terms three-dimensional random walk ``Pauli...
We develop and demonstrate a technique to engineer universal unitary baths in quantum systems. Using the correspondence between decoherence due ambient environmental noise errors control system for bits, we show how wide variety of relevant classical error models may be realized through in-phase or in-quadrature modulation on vector signal generator producing resonant carrier signal. our approach high-bandwidth 12.6-GHz appropriate trapped ${^{171}\mathrm{Yb}}^{+}$ ions. Experiments...
Growth in the complexity and capabilities of quantum information hardware mandates access to practical techniques for performance verification that function under realistic laboratory conditions. Here we experimentally characterise impact common temporally correlated noise processes on both randomised benchmarking (RB) gate-set tomography (GST). We study these using an analytic toolkit based a formalism mapping errors arbitrary sequences unitary operations. This analysis highlights role...
We study a novel class of open-loop control protocols constructed to perform arbitrary nontrivial single-qubit logic operations robust against time-dependent non-Markovian noise. Amplitude and phase modulation are crafted leveraging insights from functional synthesis the basis set Walsh functions. employ experimentally validated generalized filter-transfer function formalism in order find optimized for target SU(2) by defining cost be minimized through applied modulation. Our work details...
Abstract A class of entangling gates for trapped atomic ions is studied and the use numeric optimization techniques to create a wide range fast, error‐robust gate constructions demonstrated. framework introduced targeting maximally‐ partially‐entangling operations on ion pairs, multi‐ion registers, subsets large parallel within single register. Ions are assumed be individually addressed, permitting over amplitude‐ phase‐modulated controls. Calculations simulations demonstrate that inclusion...
Quantum harmonic oscillators are central to many modern quantum technologies. We introduce a method determine the frequency noise spectrum of oscillator modes through coupling them qubit with continuously driven qubit-state-dependent displacements. reconstruct using series different drive phase and amplitude modulation patterns in conjunction data-fusion routine based on convex optimization. apply technique identification intrinsic motional single trapped ion sensitivity fluctuations at...
We present the design, construction, and characterization of an experimental system capable supporting a broad class quantum simulation experiments with hundreds spin qubits using 9Be+ ions in Penning trap. This article provides detailed overview core optical trapping subsystems their integration. begin description dual-trap design separating loading zones associated vacuum infrastructure design. The experimental-zone trap electrodes are designed for wide-angle access (e.g., lasers used to...
We describe a high-power, frequency-tunable, external cavity diode laser system near 626 nm useful for cooling of trapped 9Be+ ions. A commercial single-mode with rated power output 170 mW at 635 is cooled to ≈−31°C, and single longitudinal mode selected via the Littrow configuration. In our setup, involving two stages thermoelectric cooling, we are able obtain ≈130 nm, sufficient efficient frequency doubling required Doppler wavelengths 313 in ionized Beryllium. order improve nonlinear...
We present and analyze two pathways to produce commercial optical-fiber patch cords with stable long-term transmission in the ultraviolet (UV) at powers up ~ 200 mW, typical bulk between 66-75 %. Commercial fiber UV are of great interest across a wide variety scientific applications ranging from biology metrology, lack availability has yet be suitably addressed. provide guide producing such solarization-resistant, hydrogen-passivated, polarization-maintaining, connectorized jacketed optical...
Integrated quantum-control protocols could bridge the gap between abstract algorithms and physical manipulation of imperfect hardware.
We describe an experimental effort designing and deploying error-robust single-qubit operations using a cloud-based quantum computer analog-layer programming access. design numerically optimized pulses that implement target exhibit robustness to various error processes including dephasing noise, instabilities in control amplitudes, crosstalk. Pulse optimization is performed flexible package incorporating device model physically relevant constraints (e.g., bandwidth limits on the transmission...
Quantum error correction provides a path to large-scale quantum computers, but is built on challenging assumptions about the characteristics of underlying errors. In particular, mathematical assumption independent errors in logic operations at odds with realistic environments where error-sources may exhibit strong temporal correlations. We present experiments enabling identification correlations between circuits, using only projective measurements end circuit. Using single trapped ion qubit...
The rapid progress seen in the development of quantum coherent devices for information processing has motivated serious consideration computer architecture and organization. One topic which remains open investigation optimization relates to design classical-quantum interface, where control operations on individual qubits are applied according higher-level algorithms; accommodating competing demands performance scalability a major outstanding challenge. In this work we present...
Experimentalists seeking to improve the coherent lifetimes of quantum bits have generally focused on mitigating decoherence mechanisms through, for example, improvements qubit designs and materials, system isolation from environmental perturbations. In case phase degree freedom in a superposition, however, coherence that must be preserved is not solely internal qubit, but rather necessarily includes relative "master clock" (e.g. local oscillator) governs its control system. this manuscript...
We study a novel class of open-loop control protocols constructed to perform arbitrary nontrivial single-qubit logic operations robust against time-dependent non-Markovian noise. Amplitude and phase modulation are crafted leveraging insights from functional synthesis the basis set Walsh functions. employ experimentally validated generalized filter-transfer function formalism in order find optimized for target SU(2) by defining cost be minimized through applied modulation. Our work details...