Suppression of the four-wave mixing amplification via Raman absorption

Romanov, G.; O’Brien, Christopher; Novikova, Irina

doi:10.1080/09500340.2015.1133856

Cited by 15 publications

(10 citation statements)

References 44 publications

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“…Four-wave-mixing (FWM) noise has been identified to be the main limitation for room-temperature vapor schemes 25 , 34 , 35 . Several strategies have been pursued to suppress this noise including ladder schemes 17 , 18 , cavity engineering 36 , absorption 37 , or Raman absorption 38 . An idea that is also suitable for Raman transitions between Zeeman levels is to use polarization selection rules 35 , 39 .…”

Section: Resultsmentioning

confidence: 99%

Room-temperature single-photon source with near-millisecond built-in memory

et al. 2021

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Non-classical photon sources are a crucial resource for distributed quantum networks. Photons generated from matter systems with memory capability are particularly promising, as they can be integrated into a network where each source is used on-demand. Among all kinds of solid state and atomic quantum memories, room-temperature atomic vapours are especially attractive due to their robustness and potential scalability. To-date room-temperature photon sources have been limited either in their memory time or the purity of the photonic state. Here we demonstrate a single-photon source based on room-temperature memory. Following heralded loading of the memory, a single photon is retrieved from it after a variable storage time. The single-photon character of the retrieved field is validated by the strong suppression of the two-photon component with antibunching as low as $${g}_{{\rm{RR| W = 1}}}^{(2)}=0.20\pm 0.07$$ g RR∣W=1 ( 2 ) = 0.20 ± 0.07 . Non-classical correlations between the heralding and the retrieved photons are maintained for up to $${\tau }_{{\rm{NC}}}^{{\mathcal{R}}}=(0.68\pm 0.08)\ {\rm{ms}}$$ τ NC R = ( 0.68 ± 0.08 ) ms , more than two orders of magnitude longer than previously demonstrated with other room-temperature systems. Correlations sufficient for violating Bell inequalities exist for up to τBI = (0.15 ± 0.03) ms.

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Section: Resultsmentioning

confidence: 99%

Room-temperature single-photon source with near-millisecond built-in memory

et al. 2021

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“…Adding a molecular buffer gas to increase the optical depth of a spin-polarised alkali vapour could enhance the Raman interaction strength and enable even higher two-mode squeezing. Furthermore, these results can be applied to a cavity-enhanced Raman memory protocol where FWM noise can be effectively suppressed to allow low-noise storage of single photons [15,31]. The dashed line in figure 4(c) shows the predicted memory efficiency if there is no FWM, and this gives an indication of the potential performance of this memory for quantum-level storage.…”

Section: Ghz D =mentioning

confidence: 92%

High efficiency Raman memory by suppressing radiation trapping

et al. 2017

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Raman interactions in alkali vapours are used in applications such as atomic clocks, optical signal processing, generation of squeezed light and Raman quantum memories for temporal multiplexing. To achieve a strong interaction the alkali ensemble needs both a large optical depth and a high level of spin-polarisation. We implement a technique known as quenching using a molecular buffer gas which allows near-perfect spin-polarisation of over 99.5% in caesium vapour at high optical depths of up to 2 10 ; 5´a factor of 4 higher than can be achieved without quenching. We use this system to explore efficient light storage with high gain in a GHz bandwidth Raman memory. OPEN ACCESS RECEIVED

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“…Fourwave-mixing (FWM) noise has been identified to be the main limitation for room-temperature vapour schemes [28,32,33]. Several strategies have been pursued to suppress this noise including ladder schemes [17,18], cavity engineering [34], absorption [35] or Raman absorption [36]. An idea that is also suitable for Raman transitions between Zeeman levels is to use polarization selection rules [33,37].…”

Section: Introductionmentioning

confidence: 99%

Room-temperature single-photon source with near-millisecond built-in memory

Dideriksen,

Schmieg,

Zugenmaier

et al. 2020

Preprint

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Non-classical photon sources are a crucial resource for distributed quantum networks. Photons generated from matter systems with memory capability are particularly promising, as they can be integrated into a network where each source is used on-demand. Among all kinds of solid state and atomic quantum memories, room-temperature atomic vapours are especially attractive due to their robustness and potential scalability. To-date room-temperature photon sources have been limited either in their memory time or the purity of the photonic state. Here we demonstrate a singlephoton source based on room-temperature memory. Following heralded loading of the memory, a single photon is retrieved from it after a variable storage time. The single-photon character of the retrieved field is validated by the strong suppression of the two-photon component with antibunching as low as g(2) RR|W=1 = 0.20 ± 0.07. Non-classical correlations between the heralding and the retrieved photons are maintained for up to τ R NC = (0.68 ± 0.08) ms, more than two orders of magnitude longer than previously demonstrated with other room-temperature systems. Correlations sufficient for violating Bell inequalities exist for up to τBI = (0.15 ± 0.03) ms.

show abstract

Suppression of the four-wave mixing amplification via Raman absorption

Cited by 15 publications

References 44 publications

Room-temperature single-photon source with near-millisecond built-in memory

Room-temperature single-photon source with near-millisecond built-in memory

High efficiency Raman memory by suppressing radiation trapping

Room-temperature single-photon source with near-millisecond built-in memory

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