Dark-time decay of the retrieval efficiency of light stored as a Rydberg excitation in a noninteracting ultracold gas

Schmidt-Eberle, Steffen; Stolz, Thomas; Rempe, Gerhard; Dürr, Stephan

doi:10.1103/physreva.101.013421

Cited by 15 publications

(13 citation statements)

References 44 publications

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“…[10], the out-performance comes from the cavity that makes the light pass through the same Rydberg blockade volume many times. This enabled us to reduce the atomic density and, in consequence, the dephasing rate due to atomic collisions [27].…”

Section: Resultsmentioning

confidence: 99%

“…When EIT coupling light is on (off), dephasing is now dominated by laser phase noise (differential light shifts in the dipole trap). Reducing laser phase noise and operating the dipole trap at a different wavelength [27] is expected to massively reduce dephasing. In addition, the delay fibre could be replaced by a high-efficiency quantum memory.…”

Section: Resultsmentioning

confidence: 99%

“…This minimises the net photon recoil in the EIT two-photon transition. Hence, this minimises dephasing caused by thermal atomic motion [27]. The control (target) EIT coupling beam has a peak power of 30 mW (70 mW).…”

Section: Eitmentioning

confidence: 99%

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Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%

Stolz,

Hegels,

Winter

et al. 2021

Preprint

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%

Stolz,

Hegels,

Winter

et al. 2021

Preprint

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“…We also compare the results with the strategy consisting of storing the input Gaussian pulse in the Rydberg state [19,41,42,43]. This can be made by switching off the control beam (Ω c → 0) when polaritons are traveling inside the medium.…”

Section: Single-photon Generation and Storagementioning

confidence: 99%

Transient dynamics of the quantum light retrieved from Rydberg polaritons

et al. 2021

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We study the photon statistics of weak coherent pulses propagating through a cold atomic ensemble in the regime of Rydberg electromagnetically induced transparency. We show experimentally that the value of the second-order autocorrelation function of the transmitted light strongly depends on the position within the pulse and heavily varies during the transients of the pulse. In particular, we show that the falling edge of the transmitted pulse displays much lower values than the rest of the pulse. We derive a theoretical model that quantitatively predicts our results and explains the physical behavior involved. Finally, we use this effect to generate single photons localized within a pulse. We show that by selecting only the last part of the transmitted pulse, the single photons show an antibunching parameter as low as 0.12 and a generation efficiency per trial larger than that possible with probabilistic generation schemes based on atomic ensembles.

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“…(3) The decay rates of atom states are γ eg /2π = MHz, γ r 1 g /2π = 3.5 kHz [56] and γ g g /2π = 16 Hz [57]. This small γ r 1 g requires the temperature of the atomic ensemble below ∼ 0.2 µK.…”

mentioning

confidence: 99%

A Hybrid Rydberg Quantum Gate for Quantum Network

Liu¹,

Li²,

Ma³

2021

Preprint

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The high fidelity storage, distribution and processing of quantum information prefers qubits with different physical properties. Thus, hybrid quantum gates interfacing different types of qubits are essential for the realization of complex quantum network structures. A Rydberg-atom based physical quantum CZ gate is proposed to hybridly process the polarisation-encoded single-photon optical qubit and the "Schroedinger cat" microwave qubit. The degradation of the fidelity under the influence of various noise channels, such as microwave cavity loss, sponetanous emission of atom states, and non-adiabaticity effect, etc, has been analyised through detailed theoretical analysis by deriving input-output relation of qubit fields. The feasibility and the challenges of the protocol within current technology are also discussed by analysing the possible experimental parameter settings.Introduction-A robust and functional quantum network [1,2] requires the simultaneous achievement of both high-fidelity local quantum operation and efficient distribution of quantum information between remote quantum nodes [3,4]. The combination of these two capabilities would enable a number of important applications, such as long distance quantum communication [5-9], distributed quantum computation [10-14] and quantum metrology [15][16][17][18][19][20]. These two capabilities have been separately demonstrated in various experiments [21,22], but it remains very challenging to combine them into a single physical system. For example, microwave (MW) superconducting qubits feature high quantum operation fidelity [23,24] but suffer severe losses and decoherence during propagation [25]. On the other hand, optical photons are ideal qubits for the purpose of long-distance quantum state distribution [22], but fault-tolerant quantum gates with optical photons remain elusive [26,27]. Naturally, the realization of a practical quantum network would largely benefit from a hybrid platform [28][29][30][31][32][33][34][35][36][37][38][39] which bridges the gap between optical and MW qubits. Therefore, designing a physical photonphoton quantum gate that (1) hybridly processes qubits at different frequencies, (2) has high fidelity is important for achieving this target.Quantum gates involving Rydberg atoms [40] would be able to satisfy the above requirements. For realising a hybrid photon-photon quantum gate, highly excited Rydberg states are employed for interfacing with the MW qubits, while the hyperfine ground states and low lying excited states can be used to process the optical qubit. Meanwhile, the Rydberg states and hyperfine ground states has long lifetime [41], which could help keeping a high fidelity of the gate [42].In this Letter, we propose a new scheme of such a Rydberg quantum CZ-gates, where the optical qubit is interfaced by eletromagnetic induced transparency (EIT) photon storage [43][44][45][46][47] and the MW qubit is processed by high quality MW cavity QED system [48][49][50][51]. The system dynamics and the gate fidelity are analysed in detai...

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Dark-time decay of the retrieval efficiency of light stored as a Rydberg excitation in a noninteracting ultracold gas

Cited by 15 publications

References 44 publications

Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%

Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%

Transient dynamics of the quantum light retrieved from Rydberg polaritons

A Hybrid Rydberg Quantum Gate for Quantum Network

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