Comparison of single-neutral-atom qubit between in bright trap and in dark trap

The fidelity of the gate operation and the coherence time of neutral atoms trapped in an optical dipole trap are figures of merit for the applications. The motion of the trapped atom is one of the key factors which influence the gate fidelity and coherence time. However, it has been considered as a classical oscillator in analysis of the coherence time. Here we treat the motion as a quantum oscillator, and the population on the vibrational states of the atom are taken into account in analyzing the gate fidelity and decoherence. We show that the fidelity of a coherent rotation gate between two hyperfine states is dramatically limited by the population distribution on the vibrational states. We also find that the description of the decoherence caused by the previously regarded inhomogeneous dephasing due to the thermal motion of the atom is actually homogeneous in a quantum view. The phase between the two hyperfine states is still preserved on different vibrational states, and the observed interference fringe will recover naturally if the differential frequency shift is stable and the vibrational states do not change. The decoherence due to the fluctuations of the trap laser intensity is also discussed. Both the gate fidelity and coherence time can be dramatically enhanced by cooling the atom into vibrational ground states and/or by using a blue-detuned trap. More importantly, we propose a ``magic'' trapping condition by preparing the atom into specific vibrational states.

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“…The dephasing time is then much longer than that in a red-detuned trap. This has been proven by our previous experiment [35].…”

Section: Dephasing Of Atom In a Blue-detuned Trapsupporting

confidence: 71%

Gate fidelity, dephasing, and ‘magic’ trapping of optically trapped neutral atom

Yang

Wang

et al. 2022

New J. Phys.

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“…which is implementation dependent through m. Depending on the physical system used in an actual experiment, lifetimes vary between orders of magnitude 10 µs and 10 s [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] with gate times on the order of magnitude of 10 ns to 1 µs [56][57][58][59]. In realistic experiments one can therefore expect that m > ∼ 1 MHz.…”

Section: Simulation Of Dynamicsmentioning

confidence: 99%

Dynamical quantum phase transitions in a noisy lattice gauge theory

Jensen,

Pedersen,

Zinner

2022

Preprint

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Lattice gauge theories (LGTs) form an intriguing class of theories highly relevant to both highenergy particle physics and low-energy condensed matter physics with the rapid development of engineered quantum devices providing new tools to study e.g. dynamics of such theories. The massive Schwinger model is known to exhibit intricate properties of more complicated theories and has recently been shown to undergo dynamical quantum phase transitions out of equilibrium. With current technology, noise is inevitable and potentially fatal for a successful quantum simulation. This paper studies the dynamics subject to noise of a (1 + 1)D U(1) quantum link model following a quench of the sign of the mass term. We find that not only is the system capable of handling noise at rates realistic in NISQ-era devices, promising the possiblity to study the target dynamics with current technology, but the effect of noise can be understood in terms of simple models. Specifically the gauge-breaking nature of bit-flip channels results in exponential dampening of state amplitudes, and thus observables, which does not affect the structures of interest. This is especially important as it demonstrates that the gauge theory can be successfully studied with devices that only exhibit approximate gauge invariance.

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“…This quantum interaction progress has been observed in cavity QED experiment. [4][5][6][7] And many quantum effects also have been realized in experiments, including non-demolition measurement, [8][9][10][11][12][13][14] quantum gates, [15][16][17][18][19] quantum entanglement, [20][21][22][23] and manipulation of single atom. [24][25][26][27] In addition, non-classical light is also shown in a cavity QED system.…”

Section: Introductionmentioning

confidence: 99%

Influence of driving ways on measurement of relative phase in a two-atoms cavity system*

Bao¹,

Xu²,

Yang³

2020

Chinese Phys. B

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We study the influence of driving ways on the interaction in a two-atoms cavity quantum electrodynamics system. The results show that driving ways can induce different excitation pathways. We show two kinds of significantly different excitation spectrums under two ways: driving cavity and driving atoms. We demonstrate that driving atoms can be considered as a method to obtain the position information of atoms. This research has very practical application values on obtaining the position information of atoms in a cavity.

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Comparison of single-neutral-atom qubit between in bright trap and in dark trap

Cited by 6 publications

References 24 publications

Gate fidelity, dephasing, and ‘magic’ trapping of optically trapped neutral atom

Gate fidelity, dephasing, and ‘magic’ trapping of optically trapped neutral atom

Dynamical quantum phase transitions in a noisy lattice gauge theory

Influence of driving ways on measurement of relative phase in a two-atoms cavity system*

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