Quantum enhanced optomechanical magnetometry

Abstract

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Entanglement-based 3D magnetic gradiometry with an ultracold atomic scattering halo

“…Diverse areas in physics harness quantum correlations to improve, for example, the sensing of gravitational waves [9], time [10], and electromagnetic fields [11]. Among these applications, quantum-assisted magnetometry is an active area for a variety of platforms, including superconducting circuits [12], nuclei in molecules [13], nitrogen-vacancy centres in diamond [14], optomechanical microcavities [15], trapped ions [8], atomic vapours [11], and ultracold atoms [16,17]. Excellent wide-field measurements of magnetic fields have been investigated in nitrogen-vacancy centres in diamond [14] and ultracold atomic systems [18].…”

Ultrabroadband and sensitive cavity optomechanical magnetometry

“…The resonant enhancement of both optical and mechanical response in a cavity optomechanical system [1,2] has enabled precision sensors [3] of displacement [4,5], force [6], mass [7], acceleration [8,9], ultrasound [10], and magnetic fields [11][12][13][14][15][16]. Cavity optomechanical magnetometers are particulary attractive, promising stateof-the-art sensitivity without the need for cryogenics, with only microwatt power consumption [11][12][13][14]16], and with silicon chip based fabrication offering scalability [15]. For instance, cavity optomechanical magnetometers working in the megahertz frequency range have been demonstrated by using a magnetostrictive material Terfenol-D, either manually deposited onto a microcavity [11,12,14] with a reported peak sensitivity of 200 pT/ √ Hz [12], or sputter coated onto the microcavity with a reported peak sensitivity of 585 pT/ √ Hz [15].…”

“…Cavity optomechanical magnetometers are particulary attractive, promising stateof-the-art sensitivity without the need for cryogenics, with only microwatt power consumption [11][12][13][14]16], and with silicon chip based fabrication offering scalability [15]. For instance, cavity optomechanical magnetometers working in the megahertz frequency range have been demonstrated by using a magnetostrictive material Terfenol-D, either manually deposited onto a microcavity [11,12,14] with a reported peak sensitivity of 200 pT/ √ Hz [12], or sputter coated onto the microcavity with a reported peak sensitivity of 585 pT/ √ Hz [15]. Efforts have also been made to improve the sensitivity at the hertz-to-kilohertz frequency range, which is relevant to many applications.…”

“…The working frequency ranges for both Type I and Type II magnetometers are more than 130 MHz, limited by the bandwidth of the photoreceivers we use in our experiment. Accumulated 3 dB bandwidths [14] of 11.3 MHz and 120 kHz are measured for the Type I and Type II magnetometers, respectively. This compares favorably to other sensitive optically-read-out magnetometers, which typically have bandwidths in the 1-10 kHz range [23][24][25][26].…”

An optomechanical heat engine with feedback-controlled in-loop light

“…Optomechanics [3] describes systems, which range from the nanoscale to macroscopic sizes, where the interaction between light and mechanical objects is exploited for enhanced metrology [4], and to explore the limits of quantum physics [5,6]. Thermal machines based on optomechanical systems have been proposed and analysed in different configurations [7][8][9][10][11][12][13][14][15].…”