Optical super-resolution sensing of a trapped ion's wave packet size

Drechsler, Martin; Wolf, Sebastian; Schmiegelow, Christian T.; Schmidt-Kaler, Ferdinand

doi:10.48550/arxiv.2104.07095

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…Photon scattering on the D1 transition can be estimated as γ ph ∼ Ũ0 Γ/( ∆) ∼ 13 s −1 with Γ = 1.23 × 10 8 s −1 in Yb + . This adverse effect may be reduced significantly by employing hollow tweezers [11,25,26] at the expense of added complexity. For a hollow beam with a waist w 0 = 0.5 µm and ∼ 160 µW we obtain a reduction in scattering rate of ∼ 10 −6 s −1 .…”

Section: Laguerre-gaussian Gaussianmentioning

confidence: 99%

Trapped Ion Quantum Computing using Optical Tweezers and the Magnus Effect

Mazzanti¹,

Gerritsma²,

Spreeuw³

et al. 2023

Preprint

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We consider the implementation of quantum logic gates in trapped ions using tightly focused optical tweezers. Strong polarization gradients near the tweezer focus lead to qubit-state dependent forces on the ion. We show that these may be used to implement quantum logic gates on pairs of ion qubits in a crystal. The qubit-state dependent forces generated by this effect live on the plane perpendicular to the direction of propagation of the laser beams opening new ways of coupling to motional modes of an ion crystal. The proposed gate does not require ground state cooling of the ions and does not rely on the Lamb-Dicke approximation, although the waist of the tightly focused beam needs to be comparable with its wavelength in order to achieve the needed field curvature. Furthermore, the gate can be performed on both ground state and magnetic field insensitive clock state qubits without the need for counter-propagating laser fields. This simplifies the setup and eliminates errors due to phase instabilities between the gate laser beams. Finally, we show that imperfections in the gate execution, in particular pointing errors < 30 nm in the tweezers reduce the gate fidelity from F 0.99998 to 0.999.

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Section: Laguerre-gaussian Gaussianmentioning

confidence: 99%

Trapped Ion Quantum Computing using Optical Tweezers and the Magnus Effect

Mazzanti¹,

Gerritsma²,

Spreeuw³

et al. 2023

Preprint

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“…For ground state qubits hollow tweezers such as those derived from e.g. Laguerre-Gaussian modes [19,20] would be the preferred choice. The challenge will be to supply sufficient curvature to such tweezers while maintaining excellent control.…”

Section: And φmentioning

confidence: 99%

“…The spin echo sequence will eliminate shot-toshot variations, but not fluctuations within a single implementation. Vanishing differential Stark shift in the center of the tweezer can be straightforwardly obtained using non-Gaussian hollow tweezers [19,20]. Another solution is to use bichromatic tweezers with wavelengths λ tw and beamwaists w 1 and w 2 .…”

mentioning

confidence: 99%

Trapped Ion Quantum Computing using Optical Tweezers and Electric Fields

Mazzanti,

Schüssler,

Espinoza

et al. 2021

Preprint

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We propose a new scalable architecture for trapped ion quantum computing that combines optical tweezers delivering qubit state-dependent local potentials with oscillating electric fields. Since the electric field allows for long-range qubit-qubit interactions mediated by the center-of-mass motion of the ion crystal alone, it is inherently scalable to large ion crystals. Furthermore, our proposed scheme does not rely on either ground state cooling or the Lamb-Dicke approximation. We study the effects of imperfect cooling of the ion crystal, as well as the role of unwanted qubit-motion entanglement, and discuss the prospects of implementing the state-dependent tweezers in the laboratory.Introduction. Trapped ions form one of the most mature laboratory systems for quantum information processing and quantum simulation [1-3]. Many of the basic building blocks needed for these technologies have been demonstrated: high fidelity detection and preparation [4], and universal quantum operations performed by external fields coupling to the internal states of the ions. While quantum gates have been performed with very high fidelities in trapped ions [5][6][7], scaling up the system while maintaining the quality of operations has proven to be challenging. In particular, as the length of ion crystals increases, the number of motional modes to which the gate lasers couple also increases. This leads to a reduction of interaction strength for gates between distant qubits [8]. Furthermore, the number of degrees of freedom with which the qubits can erroneously entangle increases.

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“…The Poynting vector or momentum density of these states swirls about a vortex line, and the intensity of the wavefront is typically zero or very small on the vortex line. (Indeed, the "hole" in the middle of the wavefront can find applications seemingly unconnected to the swirling of the states, as in stimulated emission spectroscopy studies; see [5]. )…”

Section: Introductionmentioning

confidence: 99%

Delta baryon photoproduction with twisted photons

Afanasev,

Carlson

2021

Preprint

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A future gamma factory at CERN or accelerator-based gamma sources elsewhere can include the possibility of energetic twisted photons, which are photons with a structured wave front that can allow a pre-defined large angular momentum along the beam direction. Twisted photons are potentially a new tool in hadronic physics, and we consider here one possibility, namely the photoproduction of ∆(1232) baryons using twisted photons. We show that particular polarization amplitudes isolate the smaller partial wave amplitudes and they are measurable without interference from the terms that are otherwise dominant.

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Optical super-resolution sensing of a trapped ion's wave packet size

Cited by 3 publications

References 18 publications

Trapped Ion Quantum Computing using Optical Tweezers and the Magnus Effect

Trapped Ion Quantum Computing using Optical Tweezers and the Magnus Effect

Trapped Ion Quantum Computing using Optical Tweezers and Electric Fields

Delta baryon photoproduction with twisted photons

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