Nonlinear optical magnetometry with accessible in situ optical squeezing

Otterstrom, Nils T.; Pooser, Raphael C.; Lawrie, Benjamin J.

doi:10.1364/ol.39.006533

Cited by 74 publications

(42 citation statements)

References 32 publications

(38 reference statements)

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“…spectroscopy [26], biological measurement [33], magnetometry [24,25], and continuous-variable quantum information processing [34]. Note that a squeezed vacuum is fragile to branching.…”

Section: Proposed Schemesmentioning

confidence: 99%

“…This is only applicable for atoms in the ground state without any spin degrees of freedom, such as a bosonic isotope of two-electron atoms. The second is a scanning-type quantum gas microscope with a confocal configuration with the use of a broadband squeezed vacuum [23][24][25][26]. Utilizing the squeezed vacuum and heterodyne detection of scattered light from the atoms during the Faraday process in quantum gas microscopy, we achieve an R SN greater than one while suppressing the light absorption and associated higher-band excitations.…”

Section: Introductionmentioning

confidence: 99%

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Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

et al. 2020

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We propose a quantum gas microscope for ultracold atoms that enables nondestructive atom detection, thus evading higher-band excitation and change of the internal degrees of freedom. We show that photon absorption of a probe beam cannot be ignored even in dispersive detection to obtain a signal-to-noise ratio greater than unity because of the shot noise of the probe beam under a standard measurement condition. The first scheme we consider for the nondestructive detection, applicable to an atom that has an electronic ground state without spin degrees of freedom, is to utilize a magicwavelength condition of the optical lattice for the transition for probing. The second is based on the dispersive Faraday effect and squeezed quantum noise and is applicable to an atom with spins in the ground state. In this second scheme, a scanning microscope is adopted to exploit the squeezed state and reduce the effective losses. Application to ultracold ytterbium atoms is discussed.

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“…spectroscopy [26], biological measurement [33], magnetometry [24,25], and continuous-variable quantum information processing [34]. Note that a squeezed vacuum is fragile to branching.…”

Section: Proposed Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

et al. 2020

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“…Squeezed vacuum states at audio-band frequencies are potentially useful for gravitational wave detection [1,2], quantum storage and communication [3][4][5], all-atomic magnetometer [6,7], and biological measurement [8]. In these application fields, since the quantum noise can be reduced by injecting squeezed vacuum states, the sensitivity or signal-to-noise ratio for measurements at audio-band frequencies can be improved.…”

Section: Introductionmentioning

confidence: 99%

Generation and Measurement of Squeezed Vacuum States at Audio-Band Frequencies

Gao

Feng

et al. 2019

Applied Sciences

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Squeezed vacuum states at audio-band frequencies are important quantum resources for practical applications. We demonstrated the generation of squeezed vacuum states at the audio-band frequencies from a subthreshold optical parametric oscillator with a periodically poled KTiOPO4 crystal pumped by a homemade continuous wave single-frequency dual-wavelength laser. To detect squeezed vacuum states at audio-band frequencies, the influences of the local oscillator (LO) power, the common mode rejection ratio (CMRR) of balanced homodyne detectors, and the phase jitter between the LO and squeezed vacuum field on the measurement of squeezed vacuum states at audio-band frequencies were considered. By optimizing the LO power, improving the CMRR of photodetectors to 67 dB based on the design of differential fine-tuning circuit and adjustable bias voltage, and reducing the phase jitter between the LO and squeezed vacuum field to 1.7° with the help of the coherent locking technique, 6.1 ± 0.3 dB squeezed vacuum states at audio frequencies from 5 kHz to 20 kHz were generated. A 3.0 ± 0.3 dB phase squeezed vacuum state was obtained at the audio frequency of 3.5 kHz.

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“…The angles and frequencies of the resulting photons are determined by energy-conservation and phasematching conditions. Due to the strong correlation between the resultant probe and conjugate modes, a large degree of sub-shot-noise squeezing has been demonstrated with bright beams, which may be used, for example, to enhance the sensitivity in metrological measurements [27][28][29][30][31][32][33]. The process, when not seeded with a probe beam, has been shown to result in strongly entangled output beams.…”

Section: Introductionmentioning

confidence: 99%

All-optical mode conversion via spatially multimode four-wave mixing

2016

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We experimentally demonstrate the conversion of a Gaussian beam to an approximate Bessel-Gauss mode by making use of a non-collinear four-wave mixing (4WM) process in hot atomic vapor. The presence of a strong, spatially non-Gaussian pump both converts the probe beam into a non-Gaussian mode, and generates a conjugate beam that is in a similar non-Gaussian mode. The resulting probe and conjugate modes are compared to the output of a Gaussian beam incident on an annular aperture that is then spatially filtered according to the phase-matching conditions imposed by the 4WM process. We find that the resulting experimental data agrees well with both numerical simulations, as well as analytical formulae describing the effects of annular apertures on Gaussian modes. These results show that spatially multimode gain platforms may be used as a new method of mode conversion.

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Nonlinear optical magnetometry with accessible in situ optical squeezing

Cited by 74 publications

References 32 publications

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

Schemes for nondestructive quantum gas microscopy of single atoms in an optical lattice

Generation and Measurement of Squeezed Vacuum States at Audio-Band Frequencies

All-optical mode conversion via spatially multimode four-wave mixing

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