Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Tsai, Pin-Ju; Hsiao, Ya-Fen; Chen, Ying-Cheng

doi:10.1103/physrevresearch.2.033155

Cited by 23 publications

(17 citation statements)

References 49 publications

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“…AS,AS (0). Although its violation is a bare witness of nonclassical correlations [40], from the application perspective, the high degree of violation of C-S inequality favors the successful preservation of nonclassical correlations upon the interaction of correlated photons with lossy or noisy environment [21,29,[41][42][43][44][45].…”

Section: Measurements and Characterizations Of Nonclassical Correlationsmentioning

confidence: 99%

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

Mika¹,

Slodička²

2020

J. Phys. B: At. Mol. Opt. Phys.

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Generation of nonclassical light suitable for interaction with atoms corresponds to a crucial goal pursued across the broad quantum optics community. We present the generation of nonclassical photon pairs using the process of spontaneous four-wave mixing in warm atomic vapor with an unprecedentedly high degree of nonclassical photon correlations. We show how the unique combination of excitation of atoms in the proximity of the vapor cell viewport, single excitation laser beam, double-Λ energy level scheme, auxiliary optical pumping, and particular optical filtering setups, allow for the spectral bandwidth of generated nonclassical light fields of up to 560 ± 20 MHz and low two-photon noise. We provide a quantitative analysis of particular noise mechanisms which set technological and fundamental limits on the observable photon correlations. The overall technological simplicity of the presented scheme together with the availability of spectrally matched quantum memories implementable with warm atomic vapors promises the feasibility of realization of GHz bandwidth on-demand nonclassical light sources and efficient quantum communication nodes.

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Section: Measurements and Characterizations Of Nonclassical Correlationsmentioning

confidence: 99%

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

Mika¹,

Slodička²

2020

J. Phys. B: At. Mol. Opt. Phys.

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“…The two photons are regarded as the heralding and heralded single photons, which are convenient and versatile in quantum information manipulation [1][2][3][4][5] . Therefore, biphotons have been widely utilized in applications, such as quantum memory, quantum communication, quantum interference, and entanglement generation [6][7][8][9][10][11][12][13][14][15][16][17] .…”

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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“…The photonic qubits of narrower linewidths can enable quantum components, such as quantum memories, quantum wavelength converters, and quantum phase gates, to have higher efficiencies or success rates [12][13][14][15][16][17][18][19][20][21][22][23][24]. The SPDC generation can be assisted with an optical cavity to narrow down the linewidth of single photons [25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mismatch-free scheme

Hsu,

Wang,

Chen

et al. 2020

Preprint

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We utilized the all-copropagating scheme, which maintains the phase-match condition, in the spontaneous four-wave mixing (SFWM) process to generate biphotons from a hot atomic vapor.The scheme enables our biphotons not only to surpass those in the previous works of hot-atom SFWM, but also to compete with the biphotons that are generated by either the cold-atom SFWM or the cavity-assisted spontaneous parametric down conversion. The biphoton linewidth in this work is tunable for an order of magnitude. As we tuned the linewidth to 610 kHz, the maximum twophoton correlation function, gs,as , of the biphotons is 42. This gs,as violates the Cauchy-Schwartz inequality for classical light by 440 folds, and demonstrates that the biphotons have a high purity.The generation rate per linewidth of the 610-kHz biphoton source is 1,500 pairs/(s•MHz), which is the best result of all the sub-MHz biphoton sources in the literature. By increasing the pump power by 16 folds, we further enhanced the generation rate per linewidth to 2.3×10 4 pairs/(s•MHz), while the maximum g (2) s,as became 6.7. In addition, we are able to tune the linewidth down to 290±20 kHz. This is the narrowest linewidth to date, among all the various kinds of single-mode biphotons.

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Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Cited by 23 publications

References 49 publications

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

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

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

Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mismatch-free scheme

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