Probing Spin Correlations in a Bose-Einstein Condensate Near the Single-Atom Level

Qu, An; Evrard, Bertrand; Dalibard, Jean; Gerbier, Fabrice

doi:10.1103/physrevlett.125.033401

Cited by 51 publications

(38 citation statements)

References 49 publications

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“…In these experiments, imaging imperfections fundamentally limit the efficacies of quantum protocols. For example, Qu et al [7] used principle component analysis to correct for background light in order to fully characterize a quantum state.…”

Section: Introductionmentioning

confidence: 99%

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

Malia,

Wu,

Martínez-Rincón

et al. 2021

Preprint

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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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Section: Introductionmentioning

confidence: 99%

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

Malia,

Wu,

Martínez-Rincón

et al. 2021

Preprint

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show abstract

“…For weak Raman couplings and zero total magnetization, the dressed system is well described by a one-axis-twisting collective spin Hamiltonian [40][41][42]. The realization of the same model in undressed spinor condensates has led to the observation of various quantum many-body phenomena [43], including the formation of spin domains and topological defects [44][45][46][47][48][49][50][51][52][53][54], and the generation of macro-scopic entanglement [55][56][57][58][59][60][61][62][63][64][65][66][67], with prospects for metrological applications [68].…”

Section: Introductionmentioning

confidence: 99%

Excited-state quantum phase transitions in spin-orbit coupled Bose gases

Cabedo,

Celi

2021

Preprint

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Excited-state quantum phase transitions depend on and reveal the structure of the whole spectrum of many-body systems. While they are theoretically well understood, finding suitable signatures and detect them in actual experiments remains challenging. For instance, in spinor gases, excitedstate phases have been identified and characterized through a topological order parameter that is challenging to measure in experiments. Here, we propose the Raman-dressed spin-orbit coupled gas as a novel platform to explore excited-state quantum phase transitions. In a weakly-coupled regime, the dressed system is equivalent to a spinor gas with tunable spin-spin interactions. Through this equivalence we are able to define a new excited-state phase of the dressed gas. The phase is characterize by the the behavior of the spatial density modulations, or stripes, induced by spin-orbit coupling, and can in principle be measured in current state-of-the-art experiments with ultracold atoms. Conversely, we show that the properties of the excited phase can be exploited to prepare stripe states with large and stable density modulations.

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“…The squeezing is a result of the quenching and subsequent dynamics generated by the the final Hamiltonian, which is either of the one-axis twisting form [3,4] or a close variant [5,6]. Spin squeezed states have also been generated without quenching through the QCP by parametric/Floquet excitation [7,8].…”

Section: Introductionmentioning

confidence: 99%

Fast generation of time-stationary spin-1 squeezed states by non-adiabatic control

Xin,

Chapman,

Kennedy

2021

Preprint

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A protocol for the creation of time-stationary squeezed states in a spin-1 Bose condensate is proposed. The method consists of a pair of controlled quenches of an external magnetic field, which allows tuning of the system Hamiltonian in the vicinity of a phase transition. The quantum fluctuations of the system are well described by quantum harmonic oscillator dynamics in the limit of large system size, and the method can be applied to a spin-1 gas prepared in the low or high energy polar states.

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Probing Spin Correlations in a Bose-Einstein Condensate Near the Single-Atom Level

Cited by 51 publications

References 49 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

Excited-state quantum phase transitions in spin-orbit coupled Bose gases

Fast generation of time-stationary spin-1 squeezed states by non-adiabatic control

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