A5082191687- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
- Neural Networks and Reservoir Computing
- Cloud Computing and Resource Management
- VLSI and Analog Circuit Testing
- Cold Atom Physics and Bose-Einstein Condensates
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Electrical Measurement Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Parallel Computing and Optimization Techniques
- Sparse and Compressive Sensing Techniques
- Force Microscopy Techniques and Applications
- Bayesian Methods and Mixture Models
- Electromagnetic Compatibility and Noise Suppression
- Scheduling and Optimization Algorithms
- Vehicle Dynamics and Control Systems
- Photoacoustic and Ultrasonic Imaging
- VLSI and FPGA Design Techniques
- Distributed Sensor Networks and Detection Algorithms
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
Honeywell (United States)
2020-2021
National Institute of Standards and Technology
2018
University of New Mexico
2014-2017
Miami University
2011
University of Maryland, Baltimore
1984
Johns Hopkins University
1984
We describe and benchmark a new quantum charge-coupled device (QCCD) trapped-ion computer based on linear trap with periodic boundary conditions, which resembles race track. The system successfully incorporates several technologies crucial to future scalability—including electrode broadcasting, multilayer rf routing, magneto-optical (MOT) loading—while maintaining, in some cases exceeding, the gate fidelities of previous QCCD systems. is initially operated 32 qubits, but upgrades will allow...
In this work we introduce an open source suite of quantum application-oriented performance benchmarks that is designed to measure the effectiveness computing hardware at executing applications. These probe a computer's on various algorithms and small applications as problem size varied, by mapping out fidelity results function circuit width depth using framework volumetric benchmarking. addition estimating generated execution, benchmark certain aspects execution pipeline in order provide...
We study quantum process tomography given the prior information that map is a unitary or close to process. show on $d$-level system completely characterized by minimal set of ${d}^{2}+d$ elements associated with collection POVMs, in contrast ${d}^{4}\ensuremath{-}{d}^{2}$ required for general positive trace-preserving map. To achieve this lower bound, one must probe particular sets $d$ pure states. further compare performance different estimators inspired compressed sensing, reconstruct...
We compare two different implementations of fault-tolerant entangling gates on logical qubits. In one instance, a twelve-qubit trapped-ion quantum computer is used to implement non-transversal CNOT gate between five qubit codes. The operation evaluated with varying degrees fault tolerance, which are provided by including error correction circuit primitives known as flagging and pieceable tolerance. the second twenty-qubit transversal [[7,1,3]] color codes were implemented but similar...
The quantum volume test is a full-system benchmark for computers that sensitive to qubit number, fidelity, connectivity, and other quantities believed be important in building useful devices. was designed produce single-number measure of computer's general capability, but complete understanding its limitations operational meaning still missing. We explore the better understand design aspects, sensitivity errors, passing criteria, what implies about computer. elucidate some transient...
We describe and benchmark a new quantum charge-coupled device (QCCD) trapped-ion computer based on linear trap with periodic boundary conditions, which resembles race track. The system successfully incorporates several technologies crucial to future scalability, including electrode broadcasting, multi-layer RF routing, magneto-optical (MOT) loading, while maintaining, in some cases exceeding, the gate fidelities of previous QCCD systems. is initially operated 32 qubits, but upgrades will...
Quantum state teleportation is commonly used in designs for large-scale quantum computers. Using Quantinuum's H2 trapped-ion processor, we demonstrate fault-tolerant circuits a error correction code-specifically the Steane code. The use up to 30 qubits at physical level and employ real-time correction. We conducted experiments on several variations of logical using both transversal gates lattice surgery. measured process fidelity be 0.975 ± 0.002 implementation 0.851 0.009 surgery as well...
We consider the problem of quantum-state tomography under assumption that state is pure, and more generally its rank bounded by a given value $r$. In this scenario two notions informationally complete measurements emerge: rank-$r$-complete rank-$r$ strictly-complete measurements. Whereas in first notion, uniquely identified from within set states, second notion same all physical any rank. argue, therefore, are compatible with convex optimization, we prove they allow robust estimation...
Midcircuit measurement and reset are crucial primitives in quantum computation, but such operations require strong interactions with selected qubits while maintaining isolation of neighboring qubits, which is a significant challenge many systems. For trapped ion systems, performed laser-induced fluorescence. Stray light from the detection beam fluorescence measured ions can be sources decoherence for unmeasured qubits. We present technique using micromotion to reduce these by over an order...
Estimation of quantum states and measurements is crucial for the implementation information protocols. The standard method each tomography. However, tomography suffers from systematic errors caused by imperfect knowledge system. We present a procedure to simultaneously characterize that mitigates use single high-fidelity state preparation limited set unitary operations. Such operations are typical many state-of-the-art systems. For this situation we design experiments an optimization...
Population leakage outside the qubit subspace presents a particularly harmful source of error that cannot be handled by standard correction methods. Using trapped $^{171}$Yb$+$ ion, we demonstrate an optical pumping scheme to suppress errors in atomic hyperfine qubits. The selection rules and narrow linewidth quadrupole transition are used selectively pump population out states back into subspace. Each cycle reduces factor $\sim3$, allowing for exponential suppression number cycles. We use...
The authors propose and demonstrate a new method for measuring the quality of an entangling operations in trapped-ion quantum computers. They use to tune up operation rivaling current world-record error rates, while providing fidelity characterization gate this quality.
Empirical evidence for a gap between the computational powers of classical and quantum computers has been provided by experiments that sample output distributions two-dimensional circuits. Many attempts to close this have utilized simulations based on tensor network techniques, their limitations shed light improvements hardware required frustrate simulability. In particular, having in excess approximately 50 qubits are primarily vulnerable simulation due restrictions gate fidelity...
To date, the highest fidelity quantum logic gates between two qubits have been achieved with variations on geometric-phase gate in trapped ions, leading variants being Molmer-Sorensen and light-shift (LS) gate. Both of these approaches their respective advantages challenges. For example, latter is technically simpler natively insensitive to optical phases, but it has not made work directly a clock-state qubit. We present new technique for implementing LS that combines best features...
Leakage errors are unwanted transfer of population outside a defined computational subspace and they occur in almost every platform for quantum computing. While prevalent, leakage is often overlooked when measuring reporting the performance computers with standard randomized benchmarking methods. In fact, substantial it can cause large overestimation fidelity. We provide several methods fidelity presence that applicable different error regimes or under differnt control assumptions....
Quantum tomography is a critically important tool to evaluate quantum hardware, making it essential develop optimized measurement strategies that are both accurate and efficient. We compare variety of using nearly pure test states. Those informationally complete for all states found be reliable even in the presence errors measurements themselves, while those designed only far more efficient but highly sensitive such errors. Our results highlight unavoidable trade-offs inherent tomography.
We study the production of arbitrary superpositions Dicke states via optimal control. show that N atomic hyperfine qubits, interacting symmetrically Rydberg blockade, are well described by Jaynes-Cummings Hamiltonian and fully controllable phase-modulated microwaves driving Rydberg-dressed states. With currently feasible parameters, it is possible to generate ∼ten qubits in ∼1 μs, assuming a fast microwave phase switching time. The same control can be achieved with "dressed-ground control"...
The QED-C suite of Application-Oriented Benchmarks provides the ability to gauge performance characteristics quantum computers as applied real-world applications. Its benchmark programs sweep over a range problem sizes and inputs, capturing key metrics related quality results, total time execution, gate resources consumed. In this manuscript, we investigate challenges in broadening relevance benchmarking methodology applications greater complexity. First, introduce method for improving...
Empirical evidence for a gap between the computational powers of classical and quantum computers has been provided by experiments that sample output distributions two-dimensional circuits. Many attempts to close this have utilized simulations based on tensor network techniques, their limitations shed light improvements hardware required frustrate simulability. In particular, having in excess $\sim 50$ qubits are primarily vulnerable simulation due restrictions gate fidelity connectivity,...
In this work we introduce an open source suite of quantum application-oriented performance benchmarks that is designed to measure the effectiveness computing hardware at executing applications. These probe a computer's on various algorithms and small applications as problem size varied, by mapping out fidelity results function circuit width depth using framework volumetric benchmarking. addition estimating generated execution, benchmark certain aspects execution pipeline in order provide...