High nonclassical correlations of large-bandwidth photon pairs generated in warm atomic vapor

Mika, Jaromír; Slodička, L.

doi:10.1088/1361-6455/ab8717

Cited by 17 publications

(15 citation statements)

References 59 publications

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“…1 depicts a simplified experimental scheme and main source characteristics. We have implemented several crucial improvements of our scheme [54] which contributed to the simultaneous enhancement of the overall two-photon coupling efficiency η 2ph = P C /P AS to up to 9.0 ± 0.2 % complemented by a more than a tenfold improvement of generated Stokes M S and anti-Stokes M AS photon detection rates and by a twofold increase in photon coincidence rates to C = 7.7 ± 0.1 kHz evaluated for the coincidence time window T bin = 486 ps. At the same time, sufficiently high nonclassical correlations between Stokes and anti-Stokes fields on the order of g…”

Section: Resultsmentioning

confidence: 99%

“…S,AS (0) ∼ 50, observable for low excitation powers, could be maintained. The combination of the interaction area corresponding to the spatial overlap of excitation lasers and detection mode within the atomic ensemble in the proximity of the vapor cell viewport [54], efficient auxiliary optical pumping (OP) with a help of atomic polarization preserving coating of vapor cell [47], and particular polarization, spectral, and spatial filtering (F S , F AS ), provide conditions for sufficient two-photon coupling efficiencies and, simultaneously, allow for the feasibility of generation of very high nonclassical correlations and low noise contribution in both Stokes and anti-Stokes fields.…”

Section: Resultsmentioning

confidence: 99%

“…Despite significant advancements in demonstrations of operation of narrowband SPDC sources utilizing optical cavities have been demonstrated [36][37][38][39][40][41][42], with most recent works approaching a single-mode regime [43], a provable observation of a single-mode QNG light still remains an open challenge [3]. A rapid development in realization of spon-taneous four-wave mixing (SFWM) photon sources with warm atomic vapors over the past decade brought experimentally very feasible demonstrations of a rich variety of spectrally narrow-band and provably nonclassical light with strongly sub-Poissonian and anti-bunched statistics promising a natural applicability for interaction with target atomic ensembles and storage in quantum memories due to their spectral compatibility [44][45][46][47][48][49][50][51][52][53][54]. However, to unambiguously surpass the QNG thresholds [55], the combination of a residual two-photon noise component and a two-photon coupling efficiency, which are partially competing requirements, have to be established at an unprecedented level [3,55].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Single-mode Quantum Non-Gaussian Light from Warm Atoms

Mika¹,

Lachman²,

Lamich³

et al. 2022

Preprint

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The distributed quantum information processing and hybridization of quantum platforms raises increasing demands on the quality of light-matter interaction and realization of efficient quantum interfaces. This becomes particularly challenging for needed states possessing fundamental quantum non-Gaussian (QNG) aspects. They correspond to paramount resources in most potent applications of quantum technologies. We demonstrate the generation of light with provably QNG features from a tunable warm atomic ensemble in a single-mode regime. The light is generated in a spontaneous four-wave mixing process in the presence of decoherence effects caused by a large atomic thermal motion. Despite its high sensitivity to any excess noise, a direct observability of heralded QNG light could be achieved due to a combination of a fast resonant excitation, large spectral bandwidth, and a low absorption loss of resonant photons guaranteed by the source geometry.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single-mode Quantum Non-Gaussian Light from Warm Atoms

Mika¹,

Lachman²,

Lamich³

et al. 2022

Preprint

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“…Two major physical mechanisms are used to produce biphotons: the spontaneous parametric down conversion (SPDC) [18][19][20][21][22][23][24][25][26][27][28][29][30] and spontaneous four-wave mixing (SFWM) [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] . The SPDC is employed for nonlinear crystals.…”

Section: Introductionmentioning

confidence: 99%

“…The counter-propagating scheme was commonly used in the previous hot-atom SFWM sources [41][42][43][44][45][46] .…”

Section: Introductionmentioning

confidence: 99%

Room-temperature biphoton source with a spectral brightness near the ultimate limit

Chen,

Hsu,

Huang

et al. 2021

Preprint

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The biphotons, or pairs of time-energy entangled photons, generated from a hot atomic vapor via the process of spontaneous four-wave mixing (SFWM) have the following merits: stable and tunable frequencies as well as linewidth. Such merits are very useful in the applications of long-distance quantum communication. However, the hot-atom SFWM biphoton sources previously had far lower values of generation rate per linewidth, i.e., spectral brightness, as compared with the sources of biphotons generated by the spontaneous parametric down conversion (SPDC) process. Here, we report a hot-atom SFWM source of 960-kHz biphotons with a generation rate of 3.7× 10 5 pairs/s. The high generation rate, together with the narrow linewidth, results in a spectral brightness of 3.8× 10 5 pairs/s/MHz, which is 17 times of the previous best SFWM result and also better than all known SPDC results. The all-copropagating scheme employed in our biphoton source is the key improvement, enabling the achieved spectral brightness to be about one quarter of the ultimate limit. Furthermore, this biphoton source had a signal-to-background ratio (SBR) of 2.7, which violated the Cauchy-Schwartz inequality for classical light by about two-fold. Although an increasing spectral brightness usually leads to a decreasing SBR, our systematic study indicates that both of the present spectral brightness and SBR can be further enhanced. This work demonstrates a significant advancement and provides useful knowledge in the quantum technology using photons.

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Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

Chen,

Peters,

Hsieh

et al. 2024

Adv Quantum Tech

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This review article focuses on biphoton sources based on the double‐ spontaneous four‐wave mixing (SFWM) process in laser‐cooled as well as room‐temperature or hot atomic ensembles. These biphoton sources have the advantage of providing stable frequencies, ultranarrow linewidths, and a tunability of the temporal biphoton width of more than one order of magnitude for high‐bandwidth applications. Therefore, the generated photons can be efficiently interfaced to, e.g., atomic quantum memories. In contrast, solid‐state biphoton sources typically require assistance by an optical cavity to operate at narrow linewidth that limits the tunability of the temporal width of the biphotons. Present state‐of‐the‐art double‐ SFWM biphoton sources can achieve one of the following results: a spectral linewidth of 50 kHz (290 kHz) or a temporal width of 13 (580 ns) with cold (hot) atoms, a detection rate of about 7 cps, and a generation rate of cps at a duty cycle of 0.4% or of cps in the steady state. The theoretical background of these biphoton sources, experimental implementations with cold and hot atoms, and progress over the years, will be illustrated.

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High nonclassical correlations of large-bandwidth photon pairs generated in warm atomic vapor

Cited by 17 publications

References 59 publications

Single-mode Quantum Non-Gaussian Light from Warm Atoms

Single-mode Quantum Non-Gaussian Light from Warm Atoms

Room-temperature biphoton source with a spectral brightness near the ultimate limit

Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

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