A5001902542- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Cloud Computing and Resource Management
- Quantum and electron transport phenomena
- Scientific Computing and Data Management
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Integrated Circuits and Semiconductor Failure Analysis
- Big Data and Business Intelligence
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- Mass Spectrometry Techniques and Applications
- Neural Networks and Reservoir Computing
- Semiconductor Quantum Structures and Devices
- Distributed and Parallel Computing Systems
- VLSI and Analog Circuit Testing
- Analytical Chemistry and Sensors
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Materials Characterization Techniques
- Advanced Data Storage Technologies
- Photonic and Optical Devices
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Diamond and Carbon-based Materials Research
Sandia National Laboratories
2015-2024
Sandia National Laboratories California
2002-2024
University of New Mexico
2024
University of Maryland, College Park
2011-2014
National Institute of Standards and Technology
2011-2014
Joint Quantum Institute
2011-2014
Stanford University
2006-2010
National Institute of Informatics
2010
Paderborn University
2010
University of St Andrews
2009
We report on an all-optical switch that operates at low light levels. It consists of laser beams counterpropagating through a warm rubidium vapor induce off-axis optical pattern. A switching beam causes this pattern to rotate even when the power in is much lower than The observed energy density very low, suggesting might operate single-photon level with system optimization. This approach opens possibility realizing for quantum information networks and improving transparent telecommunication networks.
We demonstrate a simple pulse shaping technique designed to improve the fidelity of spin-dependent force operations commonly used implement entangling gates in trapped-ion systems. This extension M{\o}lmer-S{\o}rensen gate can theoretically suppress effects certain frequency and timing errors any desired order is demonstrated through Walsh modulation two-qubit on trapped atomic ions. The applicable system qubits coupled collective harmonic oscillator modes.
Crosstalk is a leading source of failure in multiqubit quantum information processors. It can arise from wide range disparate physical phenomena, and introduce subtle correlations the errors experienced by device. Several hardware characterization protocols are able to detect presence crosstalk, but few provide sufficient distinguish various crosstalk one another. In this article we describe how gate set tomography, protocol for detailed operations, be used identify characterize We...
We describe a fast quantum computer based on optically controlled electron spins in charged dots that are coupled to microcavities. This scheme uses broadband optical pulses rotate and provide the clock signal system. Nonlocal two-qubit gates performed by phase shifts induced laser propagating along shared waveguide. Numerical simulations of this demonstrate high-fidelity single-qubit with operation times comparable inverse Zeeman frequency.
Quantum technologies, such as communication, computing, and sensing, offer vast opportunities for advanced research development. While an open-source ethos currently exists within some quantum especially in computer programming, we argue that there are additional advantages developing open hardware (OQH). Open encompasses software the control of devices labs, blueprints, toolkits chip design other components, well openly accessible testbeds facilities allow cloud-access to a wider scientific...
Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure coherence time ${T}_{2}$ of a spin system. We report experimental implementation all-optical echo determine semiconductor electron-spin use three ultrafast optical pulses rotate spins an arbitrary angle signal as between is lengthened. Unlike previous spin-echo using microwaves, allow clean measurements systems with dephasing times (${T}_{2}^{*}$) fast in comparison scale for microwave control. This...
The Quantum Scientific Computing Open User Testbed (QSCOUT) at Sandia National Laboratories is a trapped-ion qubit system designed to evaluate the potential of near-term quantum hardware in scientific computing applications for U.S. Department Energy and its Advanced Research program. Similar commercially available platforms, it offers that researchers can use perform algorithms, investigate noise properties unique systems, test novel ideas will be useful larger more powerful systems future....
We stabilize a chosen radio frequency beat note between two optical fields derived from the same mode-locked laser pulse train in order to coherently manipulate quantum information. This scheme does not require access or active stabilization of repetition rate. implement and characterize this external lock, context two-photon stimulated Raman transitions hyperfine ground states trapped 171Yb(+) bits.
Using an ensemble of ions to register one qubit each, the so-called trapped ion quantum computer could serve as a universal computing machine, with advantages in speed and power that device bring. However, actually making suitably large trap is far from trivial. The authors microfabricate ring-shaped demonstrate its storage 400 evenly spaced calcium ions. Its circularly symmetric trapping potential furthermore enables fundamental experiments on e.g. simulated Hawking radiation or...
This Snowmass 2021 White Paper describes the Cosmic Microwave Background Stage 4 project CMB-S4, which is designed to cross critical thresholds in our understanding of origin and evolution Universe, from highest energies at dawn time through growth structure present day. We provide an overview science case, technical design, plan.
Most near-term quantum information processing devices will not be capable of implementing error correction and the associated logical gate set. Instead, circuits implemented directly using physical native set device. These gates often have a parameterization (e.g., rotation angles) which provide ability to perform continuous range operations. Verification correct operation these across allowable parameters is important for gaining confidence in reliability devices. In this work, we...
We observe millisecond spin-flip relaxation times of donor-bound electrons in high-purity $n\text{\ensuremath{-}}\mathrm{GaAs}$. This is three orders magnitude larger than previously reported lifetimes Spin-flip are measured as a function magnetic field and exhibit strong power-law dependence for fields greater $4\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. result qualitative agreement with theory measurements quantum dots.
One of the many challenges developing an open user testbed such as QSCOUT is providing interface that maintains simplicity without compromising expressibility or control. This comprises two distinct elements: a quantum assembly language designed for specifying circuits at gate level, and low-level counterpart used describing gates in terms waveforms realize specific operations. Jaqal, "Just another language," gate-level descriptions circuits. JaqalPaw, "Jaqal pulses waveforms," its...
We demonstrate an order of magnitude reduction in the sensitivity to optical crosstalk for neighboring trapped-ion qubits during simultaneous single-qubit gates driven with individual addressing beams. Gates are implemented via two-photon Raman transitions, where is mitigated by offsetting drive frequencies each qubit avoid first-order effects from inter-beam resonance. The technique simple implement, and we find that phase-dependent due interference reduced on most impacted neighbor a...
Implementations of quantum information processing systems based on optically controlled electron spins in semiconductor dots are particulary appealing due to several features. These features include inherent ultrafast gate operation times, reasonably long decoherence small optical control power and a natural ability link fiber communication networks. We will discuss the current state art experimental implementations main elements spin qubits: qubit initialization, single-qubit gates,...
We report on the optical investigation of single electron spins bound to fluorine donor impurities in ZnSe. Measurements photon antibunching confirm presence single, isolated emitters, and magneto-optical studies are consistent with an exciton spin-impurity complex. The isolation this single-donor-bound-exciton complex its potential homogeneity offer promising prospects for a scalable semiconductor qubit interface.
Quantum computing offers a new paradigm for advancing high-energy physics research by enabling novel methods representing and reasoning about fundamental quantum mechanical phenomena. Realizing these ideals will require the development of computational tools modeling simulation, detection classification, data analysis, forecasting (HEP) experiments. While emerging hardware, software, applications are exciting opportunities, significant gaps remain in integrating such techniques into HEP...
Microfabricated surface ion traps are a principal component of many ion-based quantum information science platforms. The operational parameters these devices pushed to the edge their physical capabilities as experiments strive for increasing performance. When applied radio-frequency (RF) voltage is increased excessively, can experience damaging electric discharge events known RF breakdown. We introduce two novel techniques in situ detection breakdown, which we implemented while...
Stringent physical requirements need to be met for the high performing surface-electrode ion traps used in quantum computing, sensing, and timekeeping. In particular, these must survive a temperature environment vacuum chamber preparation support voltage rf on closely spaced electrodes. Due use of gold wire bonds aluminum pads, intermetallic growth can lead bond failure via breakage or resistance, limiting lifetime trap assembly single multi-day bake at 200$^{\circ}$C. Using traditional...
Excess micromotion can be a substantial source of errors in trapped-ion based quantum processors and clocks due to the sensitivity internal states ion external fields motion. This problem fixed by compensating background electric order position ions at RF node minimize their driven micromotion. Here we describe techniques for chains scalable surface traps. These traps are capable cancelling stray with fine spatial resolution compensate multiple closely spaced large number relatively small...
As quantum computing hardware becomes more complex with ongoing design innovations and growing capabilities, the community needs increasingly powerful techniques for fabrication failure root-cause analysis. This is especially true trapped-ion computing. aims to scale thousands of ions, electrode numbers are several hundred likely integrated-photonic components also adding electrical complexity, making faults even harder locate. In this work, we used a high-resolution magnetic imaging...
A leading application of quantum computers is the efficient simulation large unitary systems. Extending this advantage to study open Cavity Quantum Electrodynamics (CQED) systems could enable use in exploration and design many-body optical devices. Such devices have promising applications communication, simulation, computing. In work, we present an early potential for efficiently investigate CQED physics. Our simulations make a recent algorithm that maps dynamics singly excited...