A5000669616- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Advanced Semiconductor Detectors and Materials
- Nanowire Synthesis and Applications
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Advanced Fluorescence Microscopy Techniques
- Quantum optics and atomic interactions
- Stellar, planetary, and galactic studies
- Diamond and Carbon-based Materials Research
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Optical Wireless Communication Technologies
- Quantum Mechanics and Applications
- Dark Matter and Cosmic Phenomena
- Quantum Computing Algorithms and Architecture
- Force Microscopy Techniques and Applications
- Optical Coatings and Gratings
- Advanced MEMS and NEMS Technologies
- Thermal properties of materials
- Integrated Circuits and Semiconductor Failure Analysis
Jet Propulsion Laboratory
2016-2025
California Institute of Technology
2010-2023
National Institute of Standards and Technology
2021
Lancaster University
2021
Massachusetts Institute of Technology
2021
Swarthmore College
2010-2014
According to quantum mechanics, a harmonic oscillator can never be completely at rest. Even in the ground state, its position will always have fluctuations, called zero-point motion. Although fluctuations are unavoidable, they manipulated. Using microwave frequency radiation pressure, we manipulated thermal of micrometer-scale mechanical resonator produce stationary quadrature-squeezed state with minimum variance 0.80 times that state. We also performed phase-sensitive, back-action evading...
We present a 1024-element imaging array of superconducting nanowire single photon detectors (SNSPDs) using 32x32 row-column multiplexing architecture. Large arrays are desirable for applications such as imaging, spectroscopy, or particle detection.
Avoiding back-action in quantum measurements The very process of measuring a system has an influence on the through back-action. Suh et al. used evasion scheme to monitor motion miniature oscillator without influencing its (see Perspective by Bouwmeester). should help understanding fundamental limits associated with measurement and will have practical implications providing low-temperature thermometer probe extremely weak forces. Science , this issue p. 1262
We use a reservoir engineering technique based on two-tone driving to generate and stabilize quantum squeezed state of micron-scale mechanical oscillator in microwave optomechanical system. Using an independent backaction evading measurement directly quantify the squeezing, we observe $4.7\pm0.9$ dB squeezing below zero-point level, surpassing 3 limit standard parametric techniques. Our measurements also reveal evidence for additional effect. The interplay between this effect interaction...
Electromagnetic resonators can be used to probe the quantum properties of mechanical objects. Scientists show that an imbalance between phonon absorption and emission---a distinct signature---can traced back fluctuations either or microwave fields, depending on measurement details.
We developed superconducting nanowire single-photon detectors based on tungsten silicide, which show saturated internal detection efficiency up to a wavelength of 10 μm. These are promising for applications in the mid-infrared requiring sub-nanosecond timing, ultra-high gain stability, low dark counts, and high efficiency, such as chemical sensing, LIDAR, matter searches, exoplanet spectroscopy.
For photon-counting applications at ultraviolet wavelengths, there are currently no detectors that combine high efficiency (> 50%), sub-nanosecond timing resolution, and sub-Hz dark count rates. Superconducting nanowire single-photon (SNSPDs) have seen success over the past decade for in near-infrared, but little work has been done to optimize SNSPDs wavelengths below 400 nm. Here, we describe design, fabrication, characterization of UV operating between 250 370 The active areas up 56 μm...
We quantitatively investigate the extent of wind absorption signatures in X-ray grating spectra all non-magnetic, effectively single O stars Chandra archive via line profile fitting. Under usual assumption a spherically symmetric with embedded shocks, we confirm previous claims that some objects show little or no absorption. However, many other do asymmetric and blueshifted profiles, indicative For these stars, are able to derive mass-loss rates from ensemble find values lower by an average...
At ambient temperatures, graphene conducts heat via lattice vibrations called phonons, but at very low electron-phonon coupling becomes weak and thermal conductance is mostly due to electron diffusion. High-sensitivity measurements across a wide temperature range provide new, state-of-the-art data on coupling, reveal intriguing deviations from theoretical predictions regarding electron-based electric transport.
While single-pixel superconducting nanowire single photon detectors (SNSPDs) have demonstrated remarkable efficiency and timing performance from the UV to near-IR, scaling these devices large imaging arrays remains challenging. Here, we propose a new SNSPD multiplexing system using thermal coupling detection correlations between two photosensitive layers of an array. Using this architecture with channels one layer oriented in rows second columns, demonstrate capability 16-pixel accurate spot...
Abstract Qubits used in quantum computing suffer from errors, either the qubit interacting with environment, or imperfect logic gates. Effective error correcting codes require a high fidelity readout of ancilla qubits which syndrome can be determined without affecting data qubits. Here, we present detection scheme for 171 Yb + qubits, where use superconducting nanowire single photon detectors and utilize time-of-arrival statistics to improve speed. Qubit shuttling allows creating separate...
The Origins Space Telescope mission concept includes an exoplanet transit spectrometer that requires detector arrays with ultrahigh pixel-to-pixel stability. Superconducting nanowire single-photon detectors, or SNSPDs, have the potential to meet these stringent stability requirements due their digital-like output. Traditionally used for applications at near-IR telecom wavelengths, SNSPDs demonstrated near-unity detection efficiencies, ultralow dark-count rates, and high dynamic ranges. Until...
Superconducting nanowire single-photon detectors are a key technology for quantum information and science due to their high efficiency, low timing jitter, dark counts. In this work, we present detector single 1550 nm photons with up 78% detection jitter below 50 ps FWHM, 158 counts/s count rate, as well maximum rate of 1.5 giga-counts/s at 3 dB compression. The PEACOQ (Performance-Enhanced Array Counting Optical Quanta) comprises linear array 32 straight superconducting niobium nitride...
Superconducting nanowire single-photon detectors (SNSPDs) are the highest-performance photon-counting technology in near infrared, but traditional designs typically trade off between timing resolution and detection efficiency. The authors utilize transmission-line engineering differential readout to achieve a design with high efficiency low jitter simultaneously. This also enables imaging capabilities photon-number resolution, is compatible commercial time taggers. device versatile solution...
The optimization of superconducting thin-films has pushed the sensitivity nanowire single-photon detectors (SNSPDs) to mid-infrared (mid-IR). Earlier demonstrations have shown that straight tungsten silicide nanowires can achieve unity internal detection efficiency (IDE) up λ = 10 μm. For a high system (SDE), active area needs be increased, but material nonuniformity and nanofabrication-induced constrictions make mid-IR large-area meanders challenging yield. In this work, we improve...
The Deep Space Optical Communication (DSOC) project will conduct its technology demonstration concurrently with NASA's Psyche mission, which hosts the DSOC flight transceiver (FLT) on spacecraft. Ground Laser Receiver (GLR) has been developed by Jet Propulsion Laboratory and installed at Palomar Observatory 5m Hale telescope in order to receive optical downlink signal from FLT, is capable of processing discrete data rates 56 kbps 265 Mbps over course mission spanning an approximate range...
Superconducting nanowire single photon detectors (SNSPDs) are the highest-performing technology for time-resolved single-photon counting from UV to near-infrared. The recent discovery of sensitivity in micrometer-scale superconducting wires is a promising pathway explore large active area devices with application dark matter searches and fundamental physics experiments. We present 8-pixel 1 mm2 microwire (SMSPDs) μm-wide fabricated WSi MoSi films various stoichiometries using electron-beam...
Superconducting nanowire single photon detectors (SNSPDs) have shown remarkable detection characteristics, and scalable architectures allow for the fabrication of SNSPD cameras with over a hundred thousand pixels. Producing such large format devices requires use high throughput lithography process as stepper photolithography. This restricts widths to resolution limit photolithography system, which limits performance, particularly mid-infrared wavelengths. In this paper, we develop an that...
We fit every emission line in the high-resolution Chandra grating spectrum of zeta Pup with an empirical profile model that accounts for effects Doppler broadening and attenuation by bulk wind. For each sixteen lines or complexes can be reliably measured, we determine a best-fitting fiducial optical depth, tau_* = kappa*Mdot/4{pi}R_{\ast}v_{\infty}, place confidence limits on this parameter. These include seven have not previously been reported literature. The extended wavelength range these...
This work presents a method to estimate experimentally the superconducting depairing current of ultrathin films by means nanowire-style resonators. Measuring allows for better determination figure merit quality nanowires. The resonance is set impedance mismatch between nanowire and transmission line. Bias dependent shifts in measured resonant frequency correspond change kinetic inductance, which can be compared with theoretical predictions resonator current. experiments lead an unexpected...
We present an analysis of both the resolved X-ray emission-line profiles and broad-band spectrum O2 If* star HD 93129A, measured with Chandra High Energy Transmission Grating Spectrometer (HETGS). This is among earliest most massive stars in Galaxy, provides a test embedded wind-shock scenario very dense powerful wind. A major new result that continuum absorption by wind primary cause hardness observed spectrum, while intrinsically hard emission from colliding shocks contributes less than 10...