MKID digital readout tuning with deep learning

Dodkins, Rupert; Mahashabde, Sumedh; O’Brien, Kieran; Thatte, Niranjan; Fruitwala, Neelay; Walter, Alex; Meeker, Seth R.; Szypryt, Paul; Mazin, Ben

doi:10.1016/j.ascom.2018.03.001

Cited by 4 publications

(3 citation statements)

References 25 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is determined by doing frequency sweeps of every feedline at a grid of powers and then using a machine learning code to both find the resonators and determine their optimal probe powers. An algorithm to find the probe power of known resonators is outlined in Dodkins et al (2018), but has been superseded by an algorithm that simultaneously finds resonances and their ideal power which will be detailed in an upcoming publication. Our python software then computes a lookup table (LUT) containing the time-domain sum of the resonator probe tones.…”

Section: Readout Proceduresmentioning

confidence: 99%

The MKID Exoplanet Camera for Subaru SCExAO

Walter

Fruitwala

Steiger

et al. 2020

PASP

Self Cite

View full text Add to dashboard Cite

We present the MKID Exoplanet Camera (MEC), a z through J band (800-1400 nm) integral field spectrograph located behind The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) at the Subaru Telescope on Maunakea that utilizes Microwave Kinetic Inductance Detectors (MKIDs) as the enabling technology for high contrast imaging. MEC is the first permanently deployed near-infrared MKID instrument and is designed to operate both as an IFU, and as a focal plane wavefront sensor in a multi-kHz feedback loop with SCExAO. The read noise free, fast time domain information attainable by MKIDs allows for the direct probing of fast speckle fluctuations that currently limit the performance of most high contrast imaging systems on the ground and will help MEC achieve its ultimate goal of reaching contrasts of 10 −7 at 2 λ/D. Here we outline the instrument details of MEC including the hardware, firmware, and data reduction and analysis pipeline. We then discuss MEC's current on-sky performance and end with future upgrades and plans.

show abstract

Section: Readout Proceduresmentioning

confidence: 99%

The MKID Exoplanet Camera for Subaru SCExAO

Walter

Fruitwala

Steiger

et al. 2020

PASP

Self Cite

View full text Add to dashboard Cite

show abstract

“…Each pixel has a background phase height noise from twolevel system states (Gao et al 2008), and amplifier noise (Zobrist et al 2019). Additionally, the phase height responsivity, r = λ/φ, varies from pixel to pixel depending on their quality factor and consequently their bias power (Dodkins et al 2018). Only when the phase height signal to noise ratio (S/N) exceeds a defined threshold is the photon data stored to disk by the readout electronics.…”

Section: Quantizationmentioning

confidence: 99%

“…The number of functioning pixels is however lower than this value. Pixels are lost because of fabrication uncertainties leading to the spectral profile of two or more pixels overlapping, pixels having low responsivity, or pixels being driven with too much readout power Dodkins et al (2018). The dead_pix Boolean dictates whether or not to apply the pix_yield parameter.…”

Section: A3 Mkids Parametersmentioning

confidence: 99%

First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications

Dodkins

Davis

Lewis

et al. 2020

PASP

View full text Add to dashboard Cite

Optical and near-infrared Microwave Kinetic Inductance Detectors, or MKIDs are low-temperature detectors with inherent spectral resolution that are able to instantly register individual photons with potentially no false counts or readout noise. These properties make MKIDs transformative for exoplanet direct imaging by enabling photon-statistics-based planet-discrimination techniques as well as performing conventional noise-subtraction techniques on shorter timescales. These detectors are in the process of rapid development, and as such, the full extent of their performance enhancing potential has not yet be quantified.MKID Exoplanet Direct Imaging Simulator, or MEDIS, is a general-purpose end-to-end numerical simulator for high-contrast observations with MKIDs. The simulator exploits current optical propagation libraries and augments them with a new MKIDs simulation module to provide a pragmatic model of many of the degradation effects present during the detection process. We use MEDIS to demonstrate how changes in various MKID properties affect the contrast-separation performance when conventional differential imaging techniques are applied to low-flux, short duration observations. We show that to improve performance at close separations will require increasing the maximum count rate or pixel sampling when there is high residual flux after the coronagraph. We predict that taking pixel yield from the value achieved by current instruments of 80% and increasing it to 100% would result in an improvement in contrast of a factor of ∼ 4 at 3λ/D and ∼ 8 at 6λ/D. Achieving better contrast performance in this low flux regime would then require exploiting the information encoded in the photon arrival time statistics.

show abstract

Nonlinear effects in superconducting thin film microwave resonators

et al. 2020

View full text Add to dashboard Cite

We discuss how reactive and dissipative nonlinearities affect the intrinsic response of superconducting thin-film resonators. We explain how most, if not all, of the complex phenomena commonly seen can be described by a model in which the underlying resonance is a single-pole Lorentzian, but whose centre frequency and quality factor change as external parameters, such as readout power and frequency, are varied. What is seen during a vector-network-analyser measurement is series of samples taken from an ideal Lorentzian that is shifting and spreading as the readout frequency is changed. According to this model, it is perfectly proper to refer to, and measure, the resonant frequency and quality factor of the underlying resonance, even though the swept-frequency curves appear highly distorted and hysteretic. In those cases where the resonance curve is highly distorted, the specific shape of the trajectory in the Argand plane gives valuable insights into the second-order physical processes present. We discuss the formulation and consequences of this approach in the case of nonlinear kinetic inductance, two-level-system loss, quasiparticle generation, and a generic model based on a power-law form. The generic model captures the key features of specific dissipative nonlinearities, but additionally leads to insights into how general dissipative processes create characteristic forms in the Argand plane. We provide detailed formulations in each case, and indicate how they lead to the wide variety of phenomena commonly seen in experimental data. We also explain how the properties of the underlying resonance can be extracted from this data. Overall, our paper provides a self-contained compendium of behaviour that will help practitioners interpret and determine important parameters from distorted swept-frequency measurements.

show abstract

MKID digital readout tuning with deep learning

Cited by 4 publications

References 25 publications

The MKID Exoplanet Camera for Subaru SCExAO

The MKID Exoplanet Camera for Subaru SCExAO

First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications

Nonlinear effects in superconducting thin film microwave resonators

Contact Info

Product

Resources

About