Comparison of Gaussian and super Gaussian laser beams for addressing atomic qubits

Gillen, Glen; Piotrowicz, Michał; Saffman, M.

doi:10.1007/s00340-016-6407-y

Cited by 43 publications

(25 citation statements)

References 31 publications

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“…The three-level EIT line shape [29] implicitly assumes that every atom within the probe field experiences the same control-beam electric field. In practice this can be achieved by using specially engineered diffractive optics [38] to create top-hat shaped beams of light. For simplicity we take the alternate approach of expanding the control beam to approximately double the size of the probe beam.…”

Section: Control Beam Intensity Distributionmentioning

confidence: 99%

Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime

et al. 2016

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Reprinted with permission from the American Physical Society: Physical Review A 93, 043854 c 2016 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Applying large magnetic fields to gain access to the hyperfine Paschen-Back regime can isolate three-level systems in a hot alkali metal vapors, thereby simplifying usually complex atom-light interactions. We use this method to make the first direct measurement of the | 5P ||er||5D | matrix element in 87 Rb. An analytic model with only three levels accurately models the experimental electromagnetically induced transparency spectra and extracted Rabi frequencies are used to determine the dipole matrix element. We measure | 5P 3/2 ||er||5D 5/2 | = (2.290 ± 0.002 stat ± 0.04 syst )ea 0 , which is in excellent agreement with the theoretical calculations of Safronova, Williams, and Clark [Phys. Rev. A 69, 022509 (2004)].

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Section: Control Beam Intensity Distributionmentioning

confidence: 99%

Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime

et al. 2016

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“…Unfortunately composite pulses trade reduced sensitivity to noise against longer gate times and are therefore not as useful for Rydberg gates as for ground state operations. Optimized beam shaping can reduce sensitivity to pointing errors without invoking longer gate times [134].…”

Section: Experimental Issues For Rydberg Gatesmentioning

confidence: 99%

Quantum computing with atomic qubits and Rydberg interactions: progress and challenges

Saffman

2016

J. Phys. B: At. Mol. Opt. Phys.

630

567

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We present a review of quantum computation with neutral atom qubits. After an overview of architectural options and approaches to preparing large qubit arrays we examine Rydberg mediated gate protocols and fidelity for two-and multi-qubit interactions. Quantum simulation and Rydberg dressing are alternatives to circuit based quantum computing for exploring many body quantum dynamics. We review the properties of the dressing interaction and provide a quantitative figure of merit for the complexity of the coherent dynamics that can be accessed with dressing. We conclude with a summary of the current status and an outlook for future progress.

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“…The spatial dependence of Rabi frequency has been studied in Ref. [98]. The positiondependent Rabi frequencies can be written as [56] where Ω 1 (t, 0) and Ω 2 (0) are the Rabi frequencies at trap center, L x|y,i = πω 2 x|y,i /λ i is the Rayleigh length.…”

Section: B Inhomogeneous Rabi Frequencymentioning

confidence: 99%

Single Gaussian temporal pulse modulated controlled-Z gate of neutral atoms under symmetrically optical pumping

Li¹,

Shao²,

Li³

2022

Preprint

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We propose an experimentally feasible protocol for implementing the standard controlled-Z gate of neutral atoms through a symmetrical two-photon excitation process via the second resonance line, 6P in 87 Rb, with a single-Gaussian-temporal-modulation-coupling of ground state and intermediate state. For qubit states that encoded on the alkali clock states, the dynamics of system depend on different adiabatic paths modulated by Gaussian pulses, which accumulates a phase factor of π on logic qubit state |11 alone at the end of the operation. The Gaussian pulse takes the simple form of Ω0 exp[−(t − 2T ) 2 /T 2 ], and the corresponding optimal parameters can be easily determined by direct use of numerical integration. On the premise of considering only spontaneous emission, the gate fidelity can achieve 99.78% with the operation time less than 1 µs. Furthermore, we discuss in detail the impact of other sources of errors on the fidelity of logic gate and find that the use of adiabatic pulse makes the gate less sensitive to the Doppler effect and laser intensity fluctuation. By selecting suitable optical traps, the predicted fidelity of the gate can reach about 98.4% after correcting the measurement error. Compared with the existing schemes, we achieve a higher fidelity quantum logic gate through a simpler Gaussian driving field, which may be helpful to the experimental implementation of quantum computation and quantum simulation in the neutral-atoms system.

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Comparison of Gaussian and super Gaussian laser beams for addressing atomic qubits

Cited by 43 publications

References 31 publications

Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime

Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime

Quantum computing with atomic qubits and Rydberg interactions: progress and challenges

Single Gaussian temporal pulse modulated controlled-Z gate of neutral atoms under symmetrically optical pumping

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