Versatile, high-power 460 nm laser system for Rydberg excitation of ultracold potassium

Arias, A.; Helmrich, S.; Schweiger, Christoph; Ardizzone, Lynton; Lochead, G.; Whitlock, S.

doi:10.1364/oe.25.014829

Cited by 21 publications

(15 citation statements)

References 55 publications

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“…Finally, we have demonstrated excellent long-term stability with a linear drift of ∼ 1 Hz/s relative to an atomic reference. These measurement are competitive against doubly-stabilized optical clocks [32,37] and offer an order of magnitude improvement compared to similar cavity stabilized Rydberg laser systems [35,36].…”

Section: Discussionmentioning

confidence: 99%

Sub-kilohertz excitation lasers for quantum information processing with Rydberg atoms

Legaie¹,

Picken²,

Pritchard³

2018

J. Opt. Soc. Am. B

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Quantum information processing using atomic qubits requires narrow linewidth lasers with longterm stability for high fidelity coherent manipulation of Rydberg states. In this paper, we report on the construction and characterization of three continuous-wave (CW) narrow linewidth lasers stabilized simultaneously to an ultra-high finesse Fabry-Perot cavity made of ultra-low expansion (ULE) glass, with a tunable offset-lock frequency. One laser operates at 852 nm while the two locked lasers at 1018 nm are frequency doubled to 509 nm for excitation of 133 Cs atoms to Rydberg states. The optical beatnote at 509 nm is measured to be 260(5) Hz. We present measurements of the offset between the atomic and cavity resonant frequencies using electromagnetically induced transparency (EIT) for high-resolution spectroscopy on a cold atom cloud. The long-term stability is determined from repeated spectra over a period of 20 days yielding a linear frequency drift of ∼ 1 Hz/s. I. INTRODUCTIONThe field of quantum information processing (QIP) is an intensive research area. Its attractiveness lies in the possibility of speeding up classical problems and modelling complex quantum systems [1]. Neutral atoms present an attractive candidate for scalable QIP [2, 3] combining long coherence times of weakly interacting hyperfine ground states [4] with strongly interacting Rydberg states [5] to create pair-wise entanglement [6,7], perform deterministic quantum gates [8,9] and even realize a quantum simulator for Ising models [10].Rydberg excitation is typically performed using two-photon excitation due to weak single photon matrix elements from the ground state [11] and inconvenient UV wavelengths. Using a resonant two-photon excitation, Rydberg electromagnetically induced transparency (EIT) [12] can be exploited for laser frequency stabilization [13] as well as precision metrology of Rydberg state energies [14,15] and lifetimes [16], dc electric fields [17] and RF field sensors operating at both microwave [18,19] and THz [20] frequency ranges. For dense cold atom samples, the strong atomic interactions can be mapped onto the optical field to create non-linearities at the single photon level [21][22][23][24].For robust Rydberg excitation of atomic qubits for gate operations the two-photon excitation must be * Electronic address: jonathan.pritchard@strath.ac.uk

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Section: Discussionmentioning

confidence: 99%

Sub-kilohertz excitation lasers for quantum information processing with Rydberg atoms

Legaie¹,

Picken²,

Pritchard³

2018

J. Opt. Soc. Am. B

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“…1a) following Refs. [12,13]. To realize the Ramsey interferometer we use the magnetically insensitive hyperfine ground states |0 = |4S 1/2 , F = 1, m F = 0 and |1 = |4S 1/2 , F = 2, m F = 0 .…”

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confidence: 99%

Realization of a Rydberg-Dressed Ramsey Interferometer and Electrometer

et al. 2019

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We present the experimental realization and characterization of a Ramsey interferometer based on optically trapped ultracold potassium atoms, where one state is continuously coupled by an off-resonant laser field to a highly-excited Rydberg state. We show that the observed interference signals can be used to precisely measure the Rydberg atom-light coupling strength as well as the population and coherence decay rates of the Rydberg-dressed states with sub-kilohertz accuracy and for Rydberg state fractions as small as one part in 10 6 . We also demonstrate an application for measuring small, static electric fields with high sensitivity. This provides the means to combine the outstanding coherence properties of Ramsey interferometers based on atomic ground states with a controllable coupling to strongly interacting states, thus expanding the number of systems suitable for metrological applications and many-body physics studies.Ramsey interferometers involving trapped ensembles of neutral atoms or single ions have enabled the most precise measurements ever made. Besides their importance for defining time and frequency standards [1,2], they also hold great promise for searches for physics beyond the standard model [3][4][5][6][7], exploring the physics of complex quantum systems [8], and for realizing sensors capable of operating close to the Heisenberg limit [9][10][11]. By design however, the most precise Ramsey interferometers typically involve the coherent evolution of atoms that interact very weakly, either with one another or with external fields, seemingly precluding many possible applications.Here we demonstrate a Ramsey interferometer involving two magnetically insensitive hyperfine clock states, where one state is continuously coupled to a Rydberg state by an off-resonant laser field. This Rydberg-dressing approach provides the means to combine the outstanding coherence properties of atomic ground states with greatly enhanced sensitivity to external fields or controllable interparticle interactions mediated by the Rydberg state admixture. We show that strong Rydberg atom-light coupling can be reached with Ramsey coherence times that are orders of magnitude longer than the bare Rydberg state lifetime. We precisely measure the Rydberg-atom light coupling strength and independently determine the effective population decay and dephasing rates for the dressed-states, thereby identifying the dominant decoherence effects. Finally we demonstrate the suitability of the Rydberg-dressed Ramsey interferometer for metrological applications by precisely measuring a small applied electric field.The starting point for our experiments is an ultracold gas of 39 K atoms prepared in a crossed-beam optical dipole trap (shown in Fig. 1a) following Refs. [12,13]. To realize the Ramsey interferometer we use the magnetically insensitive hyperfine ground states |0 = |4S 1/2 , F = 1, m F = 0 and |1 = |4S 1/2 , F = 2, m F = 0 . The sample is spinpolarized in the initial |0 state using a sequence of optical pumping pulses and radio-fre...

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“…Instead, a two-photon transition can be used for the excitation into a high ns or nd Rydberg state, via an intermediate p state. Common twophoton excitation schemes involve combinations of infrared and blue radiation [40,41] 3k S k /(h 2 2 )) 1/6 characterizes states with small and large C 3k . The figure shows the maximum crossover distances that can be obtained for a channel k by choosing the angular momentum channel with the largest S k .…”

Section: K-rb Förster Resonancesmentioning

confidence: 99%

“…Dimer states and dispersion coefficients in K-Rb Rydberg systems have also been theoretically studied [37,38]. K-Rb in particular offers the possibility to explore effects due to the bosonic ( 85 Rb, 87 Rb, 39 K, 41 K) and the fermionic ( 40 K) quantum statistics of the atoms.…”

Section: Introductionmentioning

confidence: 99%

Strong zero-field Förster resonances in K-Rb Rydberg systems

Otto

Kjærgaard

Deb

2020

Phys. Rev. Research

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We study resonant dipole-dipole coupling and the associated van der Waals energy shifts in Rydberg excited atomic rubidium and potassium and investigate Förster resonances between interspecies pair states. A comprehensive survey over experimentally accessible pair state combinations reveals multiple candidates with small Förster defects. We crucially identify the existence of an ultrastrong, "low" electric field K-Rb Förster resonance with an extremely large zero-field crossover distance exceeding 100 μm between the van der Waals regime and the resonant regime. This resonance allows for a strong interaction over a wide range of distances and by investigating its dependence on the strength and orientation of external fields we show this to be largely isotropic. As a result, the resonance offers a highly favorable setting for studying long-range resonant excitation transfer and entanglement generation between atomic ensembles in a flexible geometry. The two-species K-Rb system establishes a unique way of realizing a Rydberg single-photon optical transistor with a high input photon rate and we specifically investigate an experimental scheme with two separate ensembles.

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Versatile, high-power 460 nm laser system for Rydberg excitation of ultracold potassium

Cited by 21 publications

References 55 publications

Sub-kilohertz excitation lasers for quantum information processing with Rydberg atoms

Sub-kilohertz excitation lasers for quantum information processing with Rydberg atoms

Realization of a Rydberg-Dressed Ramsey Interferometer and Electrometer

Strong zero-field Förster resonances in K-Rb Rydberg systems

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