Chandrashekhar Gaikwad

Understanding Pancreatic Islet Stress Responses and Developing Strategies to Improve Transplantation Grafts

Chandrashekhar Gaikwad

abstract

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Agnostic phase estimation for quantum sensing and quantum computation

F Salvati, Xingrui Song, Chandrashekhar Gaikwad, Nicole Yunger Halpern et autres

Phase estimation is crucial to quantum-information processing. Several quantum algorithms use phase estimation as a subroutine for finding unitary operators’ eigenvalues. Furthermore, phase estimation is used in quantum metrology, the field of using quantum systems to probe, measure, and estimate unknown physical …

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Agnostic Phase Estimation

Xingrui Song, F Salvati, Chandrashekhar Gaikwad, Nicole Yunger Halpern et autres

The goal of quantum metrology is to improve measurements' sensitivities by harnessing quantum resources. Metrologists often aim to maximize the quantum Fisher information, which bounds the measurement setup's sensitivity. In studies of fundamental limits on metrology, a paradigmatic setup features a qubit …

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Superconducting isolators based on time-modulated coupled-resonator systems

義人 本庄, Chandrashekhar Gaikwad, Daria Kowsari, Kater W. Murch et autres

We present a unified approach for designing isolators based on temporally modulated coupled resonator networks. Our method leverages standard superconducting quantum interference device--based resonators as building blocks, arranged in series-coupled resonators to realize a wide range of on-chip nonreciprocal devices. The devices …

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Entanglement Assisted Probe of the Non-Markovian to Markovian Transition in Open Quantum System Dynamics

Chandrashekhar Gaikwad, Daria Kowsari, Carson Brame, Xingrui Song et autres

We utilize a superconducting qubit processor to experimentally probe non-Markovian dynamics of an entangled qubit pair. We prepare an entangled state between two qubits and monitor the evolution of entanglement over time as one of the qubits interacts with a small quantum …

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Entanglement assisted probe of the non-Markovian to Markovian transition in open quantum system dynamics

Chandrashekhar Gaikwad, Daria Kowsari, Carson Brame, Xingrui Song et autres

We utilize a superconducting qubit processor to experimentally probe non-Markovian dynamics of an entangled qubit pair. We prepare an entangled state between two qubits and monitor the evolution of entanglement over time as one of the qubits interacts with a small quantum …

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Observing parity-time symmetry breaking in a Josephson parametric amplifier

Chandrashekhar Gaikwad, Daria Kowsari, Weijian Chen, Kater W. Murch

Parity-time symmetric systems can be created by coupling two modes with respective gain and loss, forming a $P\phantom{\rule{0}{0ex}}T$ dimer. Quantum limited amplification and squeezing of quadrature modes of the electromagnetic field allows the exploration of the parity-time symmetry breaking transition in a …

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Superconducting Non-Reciprocity Based on Time-Modulated Coupled-Resonator Systems

Yi Zhuang, Chandrashekhar Gaikwad, Daria Kowsari, Kater W. Murch et autres

We present a unified approach for designing a diverse range of superconducting non-reciprocal components, including circulators, isolators, and uni-directional amplifiers, based on temporally-modulated coupled resonator networks. Our method leverages standard SQUID-based resonators as building blocks, arranged in various configurations such as series-coupled, …

Observing Parity Time Symmetry Breaking in a Josephson Parametric Amplifier

Chandrashekhar Gaikwad, Daria Kowsari, Weijian Chen, Kater W. Murch

A coupled two-mode system with balanced gain and loss is a paradigmatic example of an open quantum system that can exhibit real spectra despite being described by a non-Hermitian Hamiltonian. We utilize a degenerate parametric amplifier operating in three-wave mixing mode to …

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Superconducting Non-reciprocal Bandpass Filter Based on Spatio-Temporal Inductance Modulation

Yi Zhuang, Chandrashekhar Gaikwad, Daria Kowsari, Erik A. Henriksen et autres

We present a non-magnetic, fully-integrated, superconducting non-reciprocal bandpass filter using spatio-temporal inductance modulation in coupled resonator networks, thus combining the functionalities of a conventional bandpass filter with an isolator. The bandpass filter is based on a capacitively-coupled shunt resonator architecture where the …

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Dark matter axion search using a Josephson Traveling wave parametric amplifier

C. Bartram, T. Braine, Raphael Cervantes, Nicole Crisosto et autres

We describe the first implementation of a Josephson Traveling Wave Parametric Amplifier (JTWPA) in an axion dark matter search. The operation of the JTWPA for a period of about two weeks achieved sensitivity to axion-like particle dark matter with axion-photon couplings above …

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Search for a dark-matter induced Cosmic Axion Background with ADMX

T. Nitta, T Braine, N. Du, M. Guzzetti et autres

We report the first result of a direct search for a cosmic axion background (CaB)-a relativistic background of axions that is not dark matter-performed with the axion haloscope, the Axion Dark Matter eXperiment (ADMX). Conventional haloscope analyses search for a signal with …

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