Sensitivity spectrum of a superconducting attometer

When a linear Optical Parametric Oscillator (OPO) is pumped at twice the round-trip rate of its cavity, it generates an optical comb. This comb is degenerate, made by two intertwined undistinguishable pulse trains at half the repletion rate of the pump. If one pulse experiences a phase shift at each round-trip, the degeneracy is lifted, and each tooth of the comb splits in two. Even though each comb of this unstabilized source has a bandwidth of tens of MHz, interfering them on a detector leads to a beat note with a bandwidth vanishing the closer to degeneracy. At 3 Hz beat note, we measure a bandwidth of 0.003 Hz (FWHM of the beat note spectrum), corresponding to a phase resolution of 50 picoradian, or an optical path difference of 10 attometer. Several applications will be discussed, ranging from inertial navigation to magnetometry to gravitational wave detection.When a linear Optical Parametric Oscillator (OPO) is pumped at twice the round-trip rate of its cavity, it generates an optical comb. This comb is degenerate, made by two intertwined undistinguishable pulse trains at half the repletion rate of the pump. If one pulse experiences a phase shift at each round-trip, the degeneracy is lifted, and each tooth of the comb splits in two. Even though each comb of this unstabilized source has a bandwidth of tens of MHz, interfering them on a detector leads to a beat note with a bandwidth vanishing the closer to degeneracy. At 3 Hz beat note, we measure a bandwidth of 0.003 Hz (FWHM of the beat note spectrum), corresponding to a phase resolution of 50 picoradian, or an optical path difference of 10 attometer. Several applications will be discussed, ranging from inertial navigation to magnetometry to gravitational wave detection.

Laser Resonators, Microresonators, and Beam ControlMar 16, 20261 citation

Superconducting Instrumentation for Precision Measurement and Control

R. V. Duncan

Springer proceedings in physicsJan 1, 19920 citations

Superconducting Detectors

George H. Rieke

Cambridge University Press eBooksApr 30, 20211 citation

Electron Spin Resonance Detected by Superconducting Circuits

Rangga P. Budoyo, Hiraku Toida, Shiro Saito

Superconducting circuits are promising components for future quantum information technologies such as quantum computing, quantum simulation, and quantum sensing. Superconducting quantum interference devices (SQUIDs) and superconducting flux qubits can be used as a sensitive magnetic field sensor to detect local electron spin resonance (ESR). These types of sensor are characterized by good sensitivity and high spatial resolution for electron spins. In fact, we have achieved a sensitivity of 20 spins/ $\sqrt{\text {Hz}}$ with a sensing volume of 6 fl combining a flux qubit and qubit readout using a Josephson bifurcation amplifier. As a demonstration, we measured the ESR spectrum of erbium electron spins in a Y $_{2}$ SiO $_{5}$ crystal and nitrogen vacancy centers in diamond. In both cases, we obtained reasonable electron spin parameters by fitting a simulation to the spectrum. In this way, we proved superconducting circuits to be promising magnetic field sensors for evaluating the properties of solid materials.Superconducting circuits are promising components for future quantum information technologies such as quantum computing, quantum simulation, and quantum sensing. Superconducting quantum interference devices (SQUIDs) and superconducting flux qubits can be used as a sensitive magnetic field sensor to detect local electron spin resonance (ESR). These types of sensor are characterized by good sensitivity and high spatial resolution for electron spins. In fact, we have achieved a sensitivity of 20 spins/$\sqrt{\text {Hz}}$ with a sensing volume of 6 fl combining a flux qubit and qubit readout using a Josephson bifurcation amplifier. As a demonstration, we measured the ESR spectrum of erbium electron spins in a Y$_{2}$SiO$_{5}$ crystal and nitrogen vacancy centers in diamond. In both cases, we obtained reasonable electron spin parameters by fitting a simulation to the spectrum. In this way, we proved superconducting circuits to be promising magnetic field sensors for evaluating the properties of solid materials.

Quantum science and technologyJan 1, 20211 citation

Superconducting Devices for Metrology and Standards

R.A. Kamper

Springer eBooksJan 1, 197720 citations

Frequency spectrum of a superconducting metadevice

James A. Blackburn, Matteo Cirillo, Niels Grønbech‐Jensen

We report on a systematic analysis of the frequency spectrum of a system often considered for quantum computing purposes, metadevice applications, and high-sensitivity sensors, namely a superconducting loop interrupted by Josephson junctions, the core of an rf-SQUID.We analyze both the cases in which a single junction closes the superconducting loop and the one in which the single junction is replaced by a superconducting interferometer.Perturbation analysis is employed to display the variety of the solutions of the system and the implications of the results for the present interest in fundamental and applied research are analyzed.We report on a systematic analysis of the frequency spectrum of a system often considered for quantum computing purposes, metadevice applications, and high-sensitivity sensors, namely a superconducting loop interrupted by Josephson junctions, the core of an rf-SQUID.We analyze both the cases in which a single junction closes the superconducting loop and the one in which the single junction is replaced by a superconducting interferometer.Perturbation analysis is employed to display the variety of the solutions of the system and the implications of the results for the present interest in fundamental and applied research are analyzed.

Europhysics Letters (EPL)Oct 13, 20166 citations

\sqrt{\text {Hz}}

with a sensing volume of 6 fl combining a flux qubit and qubit readout using a Josephson bifurcation amplifier. As a demonstration, we measured the ESR spectrum of erbium electron spins in a Y

_{2}

SiO

_{5}

crystal and nitrogen vacancy centers in diamond. In both cases, we obtained reasonable electron spin parameters by fitting a simulation to the spectrum. In this way, we proved superconducting circuits to be promising magnetic field sensors for evaluating the properties of solid materials.