Photon correlation transients in a weakly blockaded Rydberg ensemble

Möhl, Charles; Spong, Nicholas L. R.; Jiao, Yuechun; So, Chloe; Ilieva, Teodora; Weidemüller, Matthias; Adams, Charles S.

doi:10.1088/1361-6455/ab728f

Cited by 14 publications

(15 citation statements)

References 36 publications

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“…For 𝑅 in ≈ 10 𝜇s −1 (bottom row), saturation sets in even faster, but we observe a slight oscillation in the subsequent transmission, which reflects the superatom dynamics as the probe drives Rabi oscillations between |𝐺 and |𝑊 with strong damping due to 𝛾 𝐷 [16]. To suppress superradiant reemission of absorbed photons in the forward direction after the probe pulse [44,45], 𝛾 𝐷 has to be sufficiently strong not only compared to 1/𝜏, but also the coherent dynamics [16,34]. The dephasing is dominated by atomic motion, with additional contributions from elastic scattering of the Rydberg electron by ground state atoms [46][47][48] and the AC-Stark shift induced by the trapping light.…”

Section: Resultsmentioning

confidence: 86%

Controlled multi-photon subtraction with cascaded Rydberg superatoms as single-photon absorbers

et al. 2021

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The preparation of light pulses with well-defined quantum properties requires precise control at the individual photon level. Here, we demonstrate exact and controlled multi-photon subtraction from incoming light pulses. We employ a cascaded system of tightly confined cold atom ensembles with strong, collectively enhanced coupling of photons to Rydberg states. The excitation blockade resulting from interactions between Rydberg atoms limits photon absorption to one per ensemble and rapid dephasing of the collective excitation suppresses stimulated re-emission of the photon. We experimentally demonstrate subtraction with up to three absorbers. Furthermore, we present a thorough theoretical analysis of our scheme where we identify weak Raman decay of the long-lived Rydberg state as the main source of infidelity in the subtracted photon number and investigate the performance of the multi-photon subtractor for increasing absorber numbers in the presence of Raman decay.

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Section: Resultsmentioning

confidence: 86%

Controlled multi-photon subtraction with cascaded Rydberg superatoms as single-photon absorbers

et al. 2021

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“…The probe and control beams are circularly polarized and counter-propagate. Before the probe is switched off, the control is ramped down to zero [15]. The spatial extent of the stored photon is of order 10 × 1 × 1 µm 3 .…”

Section: Experimental Demonstrationmentioning

confidence: 99%

Single-Photon Stored-Light Interferometry

Jiao,

Spong,

Hughes

et al. 2020

Preprint

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We demonstrate a single-photon stored-light interferometer, where a photon is stored in a lasercooled atomic ensemble in the form of a Rydberg polariton with a spatial extent of 10 × 1 × 1µm 3 . The photon is subject to a Ramsey sequence, i.e. 'split' into a superposition of two paths. After a delay of up to 450 ns, the two paths are recombined to give an output dependent on their relative phase. The superposition time of 450 ns is equivalent to a free-space propagation distance of 135 m. We show that the interferometer fringes are sensitive to external fields, and suggest that stored-light interferometry could be useful for localized sensing applications.

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“…1c is used to initialise a qubit into state |0 using the two-photon polariton storage technique, |g → |e → |r , with Rabi frequencies Ω p and Ω c , see Fig. 1b, Methods and previous work [20,[48][49][50][51]. The qubit can be manipulated during storage using fast microwave pulses, with 80%/20% switching time of 10 ns.…”

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confidence: 99%

Collectively Encoded Rydberg Qubit

et al. 2021

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We demonstrate a collectively-encoded qubit based on a single Rydberg excitation-a Rydberg polariton-stored in an ensemble of N entangled atoms. Qubit rotations are performed by applying microwave fields that drive excitations between Rydberg states. Coherent read-out is preformed by mapping the polariton into a single photon. Ramsey interferometry is used to probe the coherence of the qubit, and test the robustness to external perturbations. We show that the Ramsey fringe visibility is independent of atom loss, and that dephasing due to electric field noise scales as the forth power of field amplitude. These results show that robust quantum information processing can be achieved via collective encoding using Rydberg polaritons, and hence this system could provide attractive alternative coding strategies for quantum computation and networking.

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Photon correlation transients in a weakly blockaded Rydberg ensemble

Cited by 14 publications

References 36 publications

Controlled multi-photon subtraction with cascaded Rydberg superatoms as single-photon absorbers

Controlled multi-photon subtraction with cascaded Rydberg superatoms as single-photon absorbers

Single-Photon Stored-Light Interferometry

Collectively Encoded Rydberg Qubit

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