High precision calibration of optical lattice depth based on multiple pulses Kapitza-Dirac diffraction

Zhou, Tianwei; Yang, Kaixiang; Zhai, Yueyang; Yue, Xuguang; Yang, Su; Xiang, Jinggang; Huang, Qi; Xiong, Wei; Zhou, Xiaoji; Chen, Xuzong

doi:10.1364/oe.26.016726

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…1(A), which shows the collapse and revival of the interference patterns over 2000 µs in a 3D lattice with a potential depth of 35 E r , where E r = h 2 /2mλ 2 is the recoil energy and λ = 1064 nm. The depth of the optical lattice is calibrated with a calibration uncertainty of less than 0.6% via a method that we have used previously [25].…”

Section: Quantum Collapse and Revival Dynamicsmentioning

confidence: 99%

Observation of atom-number fluctuations in optical lattices via quantum collapse and revival dynamics

et al. 2019

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Using the quantum collapse and revival phenomenon of a Bose-Einstein condensate in threedimensional optical lattices, the atom number statistics on each lattice site are experimentally investigated. We observe an interaction driven time evolution of on-site number fluctuations in a constant lattice potential with the collapse and revival time ratio as the figure of merit. Through a shortcut loading procedure, we prepare a three-dimensional array of coherent states with Poissonian number fluctuations. The following dynamics clearly show the interaction effect on the evolution of the number fluctuations from Poissonian to sub-Poissonian. Our method can be used to create squeezed states which are important in precision measurement.

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Section: Quantum Collapse and Revival Dynamicsmentioning

confidence: 99%

Observation of atom-number fluctuations in optical lattices via quantum collapse and revival dynamics

et al. 2019

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“…Ultracold atom systems provide us unique opportunity to investigate the interaction between atoms and light [1,2], quantum many-body problems [3,4], quantum precise metrology [5,6], etc. Since the experimental realization of Bose-Einstein Condensate (BEC) [7,8], numerous works have been carried out to optimize the BEC [9], extract and eliminate noise pattern [10,11] and build up atom interferometry [12,13] and so on.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric population of momentum distribution by quasi-periodically driving a triangular optical lattice

et al. 2019

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Ultracold atoms in periodical driven optical lattices enable us to investigate novel band structures and explore the topology of the bands. In this work, we investigate the impact of the ramping process of the driving signal and propose a simple but effective method to realize desired asymmetric population in momentum distribution by controlling the initial phase of the driving signal. A quasi-momentum oscillation along the shaking direction in the frame of reference co-moving with the lattice is formed, causing the formation of the mix of ground energy band and first excited band in laboratory frame, within the regime that the driving frequency is far less than the coupling frequency between ground band and higher energy bands. This method avoids the construction of intricate lattices or complex control sequence. With a triangular lattice, we experimentally investigate the influence of the initial phase, frequency, amplitude of the driving signal on the population difference, and observe good agreement with our theoretical model. This provides guidance on how to load a driving signal in driven optical lattice experiment and also potentially supplies a useful tool to form a qubit that can be used in quantum computation.

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“…The depth of the optical lattice is calibrated with a calibration uncertainty of less than 0.6% via a method we used previously. [13] Figure 1 shows the absorption images of atomic interference patterns for different lattice depths with an ensemble-averaged filling factor n = 2. The momentum distribution in the TOF images reads…”

Section: (Received 7 December 2019)mentioning

confidence: 99%

Superfluid-Mott-Insulator Transition in an Optical Lattice with Adjustable Ensemble-Averaged Filling Factors*

Yang¹,

Zhou²,

Li³

et al. 2020

Chinese Phys. Lett.

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We study the quantum phase transition from a superfluid to a Mott insulator of ultracold atoms in a three-dimensional optical lattice with adjustable filling factors. Based on the density-adjustable Bose–Einstein condensate we prepared, the excitation spectrum in the superfluid and the Mott insulator regime is measured with different ensemble-averaged filling factors. We show that for the superfluid phase, the center of the excitation spectrum is positively correlated with the ensemble-averaged filling factor, indicating a higher sound speed of the system. For the Mott insulator phase, the discrete feature of the excitation spectrum becomes less pronounced as the ensemble-averaged filling factor increases, implying that it is harder for the system to enter the Mott insulator regime with higher filling factors. The ability to manipulate the filling factor affords further potential in performing quantum simulation with cold atoms trapped in optical lattices.

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High precision calibration of optical lattice depth based on multiple pulses Kapitza-Dirac diffraction

Cited by 6 publications

References 37 publications

Observation of atom-number fluctuations in optical lattices via quantum collapse and revival dynamics

Observation of atom-number fluctuations in optical lattices via quantum collapse and revival dynamics

Asymmetric population of momentum distribution by quasi-periodically driving a triangular optical lattice

Superfluid-Mott-Insulator Transition in an Optical Lattice with Adjustable Ensemble-Averaged Filling Factors*

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