Single-Photon Interference due to Motion in an Atomic Collective Excitation

Whiting, Daniel; Šibalić, Nikola; Keaveney, James; Adams, Charles S.; Hughes, Ifan G.

doi:10.1103/physrevlett.118.253601

Cited by 47 publications

(41 citation statements)

References 42 publications

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“…In summary, we have demonstrated a broadband DLCZ quantum memory in room-temperature atoms. Low unconditional noise level, strong nonclassicality preserved among heralding photon and stored excitation, and large time bandwidth product and ability of operating at room temperature make FORD quantum memory promising for future scalable quantum technologies [1,39], and promptly applicable in building large-scale quantum networks [40].…”

Section: Discussionmentioning

confidence: 99%

A broadband DLCZ quantum memory in room-temperature atoms

Dou

Yang

et al. 2018

Commun Phys

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Quantum memory capable of stopping flying photons and storing their quantum coherence is essential for scalable quantum technologies. A room-temperature broadband quantum memory will enable the implementation of large-scale quantum systems for real-life applications. Due to either intrinsic high noises or short lifetime, it is still challenging to find a room-temperature broadband quantum memory beyond conceptual demonstration. Here, we present a far-off-resonance Duan-Lukin-Cirac-Zoller (FORD) protocol and demonstrate the broadband quantum memory in room-temperature atoms. We observe a low unconditional noise level of 10 −4 and a cross-correlation up to 28. A strong violation of Cauchy-Schwarz inequality indicates high-fidelity generation and preservation of non-classical correlation. Furthermore, the achieved cross-correlation in roomtemperature atoms exceeds the key boundary of 6 above which quantum correlation is able to violate Bell's inequality. Our results open up the door to an entirely new realm of memory-enabled quantum applications at ambient conditions. arXiv:1704.06309v2 [quant-ph]

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Section: Discussionmentioning

confidence: 99%

A broadband DLCZ quantum memory in room-temperature atoms

Dou

Yang

et al. 2018

Commun Phys

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“…Hence we observe two features in the 4WM signal that correspond to the resonances with these dressed states. For a resonant pump laser (∆ 780 = 0) and low Ω 780 , Ω 795 , the atoms that are two-photon resonant with |0 → |2 have axial speeds (5 ) where a = 2(k 2 780 + k 780 k 776 ). In Fig.…”

Section: Dependence On Coupling Beam Detuningmentioning

confidence: 99%

Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen–Back regime

Whiting

Mathew

Keaveney

et al. 2017

Journal of Modern Optics

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We present an experimental study of seeded four-wave mixing (4WM) using a diamond excitation scheme (with states from the 5S 1/2 , 5P 1/2 , 5P 3/2 and 5D 3/2 terms) in a thermal vapour of 87 Rb atoms. We investigate the 4WM spectra under the application of a strong magnetic field (0.6 T). The Zeeman interaction is strong enough to realise the hyperfine Paschen-Back regime, which has the effect of separating the optical transitions by more than the Doppler width, thereby significantly simplifying the spectral features. We show that this facilitates a quantitative comparison, even in the regime of strong dressing, between experimental data and a simple theoretical model based only on four-level optical Bloch equations.

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“…In this work, we have revealed the other type of quantum interference in the HHG process: the Fano interference between the different Floquet modes, i.e., different high-order harmonics. This quantum interference is caused when a single emitted photon with different frequencies interferes via a common free radiation field, similar to the quantum interference involving different energy states of a single quanta of light [60,61]. This type of interference might be smeared out under a phenomenological assumption.…”

Section: Discussionmentioning

confidence: 99%

Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis

et al. 2018

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Abstract:We studied the high-harmonic generation (HHG) of a two-level-system (TLS) driven by an intense monochromatic phase-locked laser based on complex spectral analysis with the Floquet method. In contrast with phenomenological approaches, this analysis deals with the whole process as a coherent quantum process based on microscopic dynamics. We have obtained the time-frequency resolved spectrum of spontaneous HHG single-photon emission from an excited TLS driven by a laser field. Characteristic spectral features of the HHG, such as the plateau and cutoff, are reproduced by the present model. Because the emitted high-harmonic photon is represented as a superposition of different frequencies, the Fano profile appears in the long-time spectrum as a result of the quantum interference of the emitted photon. We reveal that the condition of the quantum interference depends on the initial phase of the driving laser field. We have also clarified that the change in spectral features from the short-time regime to the long-time regime is attributed to the interference between the interference from the Floquet resonance states and the dressed radiation field.

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Single-Photon Interference due to Motion in an Atomic Collective Excitation

Cited by 47 publications

References 42 publications

A broadband DLCZ quantum memory in room-temperature atoms

A broadband DLCZ quantum memory in room-temperature atoms

Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen–Back regime

Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis

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