Limits on atomic qubit control from laser noise

Day, Matthew; Low, Pei Jiang; White, Brendan M.; Islam, Rajibul; Senko, Crystal

doi:10.1038/s41534-022-00586-4

Cited by 19 publications

(6 citation statements)

References 50 publications

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“…A key requirement in these applications is to reliably control the full quantum state of the system, typically by applying a sequence of phase-controlled optical pulses to the atoms. However, a major issue arises when scaling up to many atoms and large numbers of quantum operations, as errors associated to optical phase noise, atom position fluctuations and motion lead to rapidly accumulating errors [6,7,8,9].…”

Section: Context and Motivationmentioning

confidence: 99%

Robust phase-controlled gates for scalable atomic quantum processors using optical standing waves

Whitlock

2023

Quantum

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A simple scheme is presented for realizing robust optically controlled quantum gates for scalable atomic quantum processors by driving the qubits with optical standing waves. Atoms localized close to the antinodes of the standing wave can realize phase-controlled quantum operations that are potentially more than an order of magnitude less sensitive to the local optical phase and atomic motion than corresponding travelling wave configurations. The scheme is compatible with robust optimal control techniques and spatial qubit addressing in atomic arrays to realize phase controlled operations without the need for tight focusing and precise positioning of the control lasers. This will be particularly beneficial for quantum gates involving Doppler sensitive optical frequency transitions and provides an all optical route to scaling up atomic quantum processors.

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Section: Context and Motivationmentioning

confidence: 99%

Robust phase-controlled gates for scalable atomic quantum processors using optical standing waves

Whitlock

2023

Quantum

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“…However, this process has a limit: The physical structure of the laser diode limits the bandwidth to a few MHz, 13 which is a critical FN regime. 14,15 To push the performance of quantum experiments even further it is important to develop efficient methods of FN reduction for ECDLs over a wide range of Fourier frequencies up to several MHz.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low frequency noise diode-laser systems for optical atomic clocks

Kolodzie,

Mirgorodskiy,

Nölleke

et al. 2024

Novel in-Plane Semiconductor Lasers XXIII

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We introduce a diode-based laser with a fast frequency noise of 30 Hz²/Hz, corresponding to a Lorentzian linewidth of 100 Hz. We examine its characteristics in detail. Our focus is on exploring the variations and similarities in frequency noise and linewidth reduction. Additionally, we present the locking capability of these systems when applied to medium finesse cavities. The results provide insights into the unique operational characteristics of these ultra-low noise lasers and their potential applications in quantum technology.

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“…Traditionally, noise at these high frequencies was thought to average out over the much longer time scale of typical quantum evolution. However, it was recently realized that such * These authors contributed equally to this work noise limits various quantum operations [16][17][18][19][20][21][22] if it overlaps with a frequency at which the quantum system resonantly responds.…”

Section: Introductionmentioning

confidence: 99%

The effect of fast noise on the fidelity of trapped-ions quantum gates

Haim¹,

Finkelstein²,

Peleg³

et al. 2022

Preprint

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High fidelity single and multi-qubit operations compose the backbone of quantum information processing. This fidelity is based on the ability to couple single-or two-qubit levels in an extremely coherent and precise manner. A necessary condition for coherent quantum evolution is a highly stable local oscillator driving these transitions. Here we study the effect of fast noise, that is noise at frequencies much higher than the local oscillator linewidth, on the fidelity of one-and two-qubit gates in a trapped-ion system. We analyze and measure the effect of fast noise on single qubit operations including resonant π rotations and off-resonant sideband transitions . We further analyze the effect of fast phase noise on the Mølmer-Sørensen two-qubit gate. We find a unified and simple way to estimate the performance of all of these operations through a single parameter given by the noise power spectral density at the qubit response frequency. While our analysis focuses on phase noise and on trapped-ion systems, it is relevant for other sources of fast noise as well as for other qubit systems in which spin-like qubits are coupled by a common bosonic field. Our analysis can help in guiding the deign of quantum hardware platforms and gates, improving their fidelity towards fault-tolerant quantum computing.

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Limits on atomic qubit control from laser noise

Cited by 19 publications

References 50 publications

Robust phase-controlled gates for scalable atomic quantum processors using optical standing waves

Robust phase-controlled gates for scalable atomic quantum processors using optical standing waves

Ultra-low frequency noise diode-laser systems for optical atomic clocks

The effect of fast noise on the fidelity of trapped-ions quantum gates

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