Ground-state cooling of a single atom inside a high-bandwidth cavity

Uruñuela, Eduardo; Alt, Wolfgang; Keiler, Elvira; Meschede, Dieter; Pandey, Deepak; Pfeifer, Hannes; Macha, Tobias

doi:10.1103/physreva.101.023415

Cited by 8 publications

(7 citation statements)

References 31 publications

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“…This suggests that by switching between transverse spatial modes, the carrier or first sidebands can be suppressed as the application demands, which can be used to reduce undesired off-resonant effects. A related effect in the longitudinal direction has been explored for optical standing waves [21,[23][24][25][26], but the motional coupling in that case is still constrained to be along the longitudinal direction. The appearance of sidebands (i.e.…”

Section: Theorymentioning

confidence: 99%

Tunable transverse spin-motion coupling for quantum information processing

West,

Putnam,

Campbell

et al. 2020

Preprint

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Laser-controlled entanglement between atomic qubits ('spins') and collective motion in trapped ion Coulomb crystals requires conditional momentum transfer from the laser. Since the spin-dependent force is derived from a spatial gradient in the spin-light interaction, this force is typically longitudinal -parallel and proportional to the average laser k-vector (or two beams' k-vector difference), which constrains both the direction and relative magnitude of the accessible spinmotion coupling. Here, we show how momentum can also be transferred perpendicular to a single laser beam due to the gradient in its transverse profile. By controlling the transverse gradient at the position of the ion through beam shaping, the relative strength of the sidebands and carrier can be tuned to optimize the desired interaction and suppress undesired, off-resonant effects that can degrade gate fidelity. We also discuss how this effect may already be playing an unappreciated role in recent experiments.

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Section: Theorymentioning

confidence: 99%

Tunable transverse spin-motion coupling for quantum information processing

West,

Putnam,

Campbell

et al. 2020

Preprint

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“…We finally note that trapped neutral atoms require laser cooling processes, where the fast cavity domain renders the method of cavity cooling [58] inoperative and hence alternative schemes must be used [59]. With respect to atom trapping the cavity may also be used to provide a dipole trap field by engineering a resonance with a suitable second wavelength [60].…”

Section: Quantum Emitters Coupling To Ffpc Fieldsmentioning

confidence: 99%

Achievements and perspectives of optical fiber Fabry–Perot cavities

et al. 2022

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Fabry–Perot interferometers have stimulated numerous scientific and technical applications ranging from high-resolution spectroscopy over metrology, optical filters, to interfaces of light and matter at the quantum limit and more. End facet machining of optical fibers has enabled the miniaturization of optical Fabry–Perot cavities. Integration with fiber wave guide technology allows for small yet open devices with favorable scaling properties including mechanical stability and compact mode geometry. These fiber Fabry–Perot cavities (FFPCs) are stimulating extended applications in many fields including cavity quantum electrodynamics, optomechanics, sensing, nonlinear optics and more. Here we summarize the state of the art of devices based on FFPCs, provide an overview of applications and conclude with expected further research activities.

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“…4(a) and the repumper detuning (b). We load a single atom into the resonator, precool it with degenerate Raman sideband cooling (dRSC) [53] to reach the Lamb-Dicke regime, pump it to the state |2, −2 , and then cool it with cRSC for a fixed time. We use the fiber quantum channel to probe the presence or absence of the atom inside the resonator, before and after the cooling slot.…”

Section: Differential Light Shifts During Continuous Raman Sideband C...mentioning

confidence: 99%

Raman Imaging of Atoms Inside a High-bandwidth Cavity

Uruñuela,

Ammenwerth,

Malik

et al. 2022

Preprint

Self Cite

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High-bandwidth, fiber-based optical cavities are a promising building block for future quantum networks. They are used to resonantly couple stationary qubits such as single or multiple atoms with photons routing quantum information into a fiber network at high rates. In high-bandwidth cavities, standard fluorescence imaging on the atom-cavity resonance line for controlling atom positions is impaired since the Purcell effect strongly suppresses all-directional fluorescence. Here, we restore imaging of 87 Rb atoms strongly coupled to such a fiber Fabry-Pérot cavity by detecting the repumper fluorescence which is generated by continuous and three-dimensional Raman sideband cooling. We have carried out a detailed spectroscopic investigation of the repumper-induced differential light shifts affecting the Raman resonance, dependent on intensity and detuning. Our analysis identifies a compromise regime between imaging signal-to-noise ratio and survival rate, where physical insight into the role of dipole-force fluctuations in the heating dynamics of trapped atoms is gained.

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Ground-state cooling of a single atom inside a high-bandwidth cavity

Cited by 8 publications

References 31 publications

Tunable transverse spin-motion coupling for quantum information processing

Tunable transverse spin-motion coupling for quantum information processing

Achievements and perspectives of optical fiber Fabry–Perot cavities

Raman Imaging of Atoms Inside a High-bandwidth Cavity

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