High-Fidelity Rapid Ground-State Loading of an Ultracold Gas into an Optical Lattice

Masuda, S.; Nakamura, Katsuhiro; Campo, Adolfo del

doi:10.1103/physrevlett.113.063003

Cited by 76 publications

(100 citation statements)

References 58 publications

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“…The resulting harmonic trapping frequencies are (ω x , ω y , ω z ) = 2π×(28, 55, 65)Hz. After preparing a BEC in the harmonic trap, we use the non-adiabatic shortcut method [19][20][21][22] to load the BEC in a one-dimensional optical lattice (along the x direction) into the G-band at the quasi-momentum q = 0. The optical lattice…”

Section: Experiments Methods To Prepare the Atoms In The High Bandsmentioning

confidence: 99%

Observation of quantum dynamical oscillations of ultracold atoms in theFandDbands of an optical lattice

et al. 2016

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We report the observation of quantum dynamical oscillations of ultracold atomic gases in the F and D bands of a single-well optical lattice. We are able to control the Bragg reflections at the Brillouin zone edge up to the third order. As a result, we can switch the quantum dynamics from oscillations across both the F and D bands to oscillations only within the F-band. Our capability to observe these remarkable oscillations comes from the innovative non-adiabatic technique which allows us to load ultracold atoms efficiently to the G-band of an optical lattice.

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Section: Experiments Methods To Prepare the Atoms In The High Bandsmentioning

confidence: 99%

Observation of quantum dynamical oscillations of ultracold atoms in theFandDbands of an optical lattice

et al. 2016

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“…We then load the BEC into the P-band by applying a series of pulsed optical lattices within tens of microseconds [13][14][15][16]. There are many other methods preparing a BEC in the P-band quantum state [4,[17][18][19][20], but normally the loading time is tens of milliseconds.…”

Section: Preparation Of P-band Quantum State With a Shortcut Methodsmentioning

confidence: 99%

Long-time nonlinear dynamical evolution forP-band ultracold atoms in an optical lattice

et al. 2015

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We report the long-time nonlinear dynamical evolution of ultracold atomic gases in the P-band of an optical lattice. A Bose-Einstein condensate (BEC) is fast and efficiently loaded into the Pband at zero quasi-momentum with a non-adiabatic shortcut method. For the first one and half milliseconds, these momentum states undergo oscillations due to coherent superposition of different bands, which are followed by oscillations up to 60ms of a much longer period. Our analysis shows the dephasing from the nonlinear interaction is very conducive to the long-period oscillations induced by the variable force due to the harmonic confinement.

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“…2 the ground state wave function, ψ i (x), of a harmonic potential of angular frequency ω 0 is split into five parts (given by ground states of corresponding harmonic oscillators) separated by a distance of 3a 0 /4 = 3( /mω 0 ) 1/2 /4, each having an eighth of the initial width. The time-dependent potential deduced from the theoretical framework provides an exact solution for the perfect loading of a periodic structure, an important operation for cold atoms [26][27][28][29][30][31]. The transformation is performed here in a time interval equal to 10π.…”

Section: B Splitting Of a Wave Functionmentioning

confidence: 99%

Fast driving between arbitrary states of a quantum particle by trap deformation

et al. 2016

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By performing a slow adiabatic change between two traps of a quantum particle, it is possible to transform an eigenstate of the original trap into the corresponding eigenstate of the final trap. If no level crossings are involved, the process can be made faster than adiabatic by setting first the interpolated evolution of the wave function from its initial to its final form and inferring from this evolution the trap deformation. We find a simple and compact formula which gives the trap shape at any time for any interpolation scheme. It is applicable even in complicated scenarios where there is no adiabatic process for the desired state-transformation, e.g., if the state changes its topological properties. We illustrate its use for the expansion of a harmonic trap, for the transformation of a harmonic trap into a linear trap and into an arbitrary number of traps of a periodic structure. Finally, we study the creation of a node exemplified by the passage from the ground state to the first excited state of a harmonic oscillator.

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High-Fidelity Rapid Ground-State Loading of an Ultracold Gas into an Optical Lattice

Cited by 76 publications

References 58 publications

Observation of quantum dynamical oscillations of ultracold atoms in theFandDbands of an optical lattice

Observation of quantum dynamical oscillations of ultracold atoms in theFandDbands of an optical lattice

Long-time nonlinear dynamical evolution forP-band ultracold atoms in an optical lattice

Fast driving between arbitrary states of a quantum particle by trap deformation

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