Free Space Ramsey Spectroscopy in Rubidium with Noise below the Quantum Projection Limit

Malia, Benjamin K.; Martínez-Rincón, Julián; Wu, Yunfan; Hosten, Onur; Kasevich, Mark A.

doi:10.1103/physrevlett.125.043202

Cited by 19 publications

(25 citation statements)

References 22 publications

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“…As we show below, these imperfections, inferred to be 10% across a mm-scale spatially extended cloud, led to a 33% increase in the noise variance in the work of Ref. [12].…”

Section: Spin Squeezing Measurementsmentioning

confidence: 73%

“…(1,2) z /C(N/2) on the multiparticle Bloch sphere, where C is the contrast in a Ramsey sequence. In the case of the data in [12], which is the subject of our analysis in this paper, C = 0.92 and the QPN is defined as ∆θ = 1/ √ N .…”

Section: Spin Squeezing Measurementsmentioning

confidence: 99%

“…Eliminating extra noise sources is crucial to taking advantage of the noise reduction from spin squeezing. The relevant details of our experiment [12] are summarized here. 87 Rb atoms are cooled and trapped in an optical lattice.…”

Section: Spin Squeezing Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Utilizing machine learning to improve the precision of fluorescence imaging of cavity-generated spin squeezed states

Malia,

Wu,

Martínez-Rincón

et al. 2021

Preprint

Self Cite

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We present a supervised learning model to calibrate the photon collection rate during the fluorescence imaging of cold atoms. The linear regression model finds the collection rate at each location on the sensor such that the atomic population difference equals that of a highly precise optical cavity measurement. This 192 variable regression results in a measurement variance 27% smaller than our previous single variable regression calibration. The measurement variance is now in agreement with the theoretical limit due to other known noise sources. This model efficiently trains in less than a minute on a standard personal computer's CPU, and requires less than 10 minutes of data collection. Furthermore, the model is applicable across a large changes in population difference and across data collected on different days.

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“…As we show below, these imperfections, inferred to be 10% across a mm-scale spatially extended cloud, led to a 33% increase in the noise variance in the work of Ref. [12].…”

Section: Spin Squeezing Measurementsmentioning

confidence: 73%

Section: Spin Squeezing Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Utilizing machine learning to improve the precision of fluorescence imaging of cavity-generated spin squeezed states

Malia,

Wu,

Martínez-Rincón

et al. 2021

Preprint

Self Cite

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“…Specifically, a great interest resides in atomic systems consisting of alkali atoms such as rubidium (Rb) or cesium. Using such systems, one can study phenomena ranging from quantum entanglement [11][12][13] , and Rydberg excitation in atoms 14,15 , to myriad of other quantum phenomena, from Bose Einstein condensation to Ramsey spectroscopy [16][17][18] . A recent effort is geared towards incorporating such atoms into the chip scale systems [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Large cooperativity in strongly coupled chip-scale photonic-atomic integrated system

Naiman¹,

Sebbag²,

Talker³

et al. 2021

Preprint

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The miniaturization of atomic quantum systems and their integration into silicon microchips paves the way for a wide variety of applications in quantum computing, metrology and magnetometry. A particular interest is found in the integration of quantum entities into the micro and nanoscale photonic resonators to implement chip scale cavity quantum electrodynamics. Here we demonstrate the interaction of a chip scale micro disc resonator with thermal rubidium atoms via the evanescent field of the mode. We observe high Rabi splitting of 4 GHz in the transmission spectrum of the coupled photonic-atomic system due to collective enhancement of the coupling rate by the ensemble of hot atoms and present a theoretical model to support the measured results. This result corresponds to atom-photon cooperativity of ~ 1. Such cooperativity is the onset for quantum interference, needed for high-end chip scale quantum technologies, such as such as quantum manipulation, quantum information storage and processing, and few photon switching.

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“…One approach utilizes spin squeezing [13][14][15] generated in an ensemble of ultracold neutral atoms [16][17][18][19]. It has been shown that spin squeezing makes it possible to surpass the SQL in atomic clocks [18,20] and atomic magnetometers [21,22]. In these experiments, spin-squeezed states were generated in large ensembles of atoms (10 5 -10 6 ), but only a small fraction of the atoms (approximately 0.1%) have been actually entangled [18].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Errors in Interferometry with Entangled Atoms

2020

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Recent progress in generating entangled spin states of neutral atoms provides opportunities to advance quantum sensing technology. In particular, entanglement can enhance the performance of accelerometers and gravimeters based on light-pulse atom interferometry. We study the effects of error sources that may limit the sensitivity of such devices, including errors in the preparation of the initial entangled state, imperfections in the laser pulses, momentum spread of the initial atomic wave packet, measurement errors, spontaneous emission, and atom loss. We determine that, for each of these errors, the expectation value of the parity operator has the general form = 0 cos(N φ), where φ is the interferometer phase and N is the number of atoms prepared in the maximally entangled Greenberger-Horne-Zeilinger state. Correspondingly, the minimum phase uncertainty has the general form φ = (0 N) −1. Each error manifests itself through a reduction of the amplitude of the parity oscillations, 0 , below the ideal value of 0 = 1. For each of the errors, we derive an analytic result that expresses the dependence of 0 on error parameter(s) and N , and also obtain a simplified approximate expression valid when the error is small. Based on the performed analysis, entanglement-enhanced atom interferometry appears to be feasible with existing experimental capabilities.

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Free Space Ramsey Spectroscopy in Rubidium with Noise below the Quantum Projection Limit

Cited by 19 publications

References 22 publications

Utilizing machine learning to improve the precision of fluorescence imaging of cavity-generated spin squeezed states

Utilizing machine learning to improve the precision of fluorescence imaging of cavity-generated spin squeezed states

Large cooperativity in strongly coupled chip-scale photonic-atomic integrated system

Characterization of Errors in Interferometry with Entangled Atoms

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