Experimental superradiance and slow-light effects for quantum memories

Walther, Andreas; Amari, Atia; Kröll, Stefan; Калачев, А. А.

doi:10.1103/physreva.80.012317

Cited by 34 publications

(41 citation statements)

References 36 publications

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“…The measurements were performed on the site 1 transition 1 D 2 − 3 H 4 at 605.977 nm in a Pr 3+ :Y 2 SiO 5 crystal immersed in liquid helium at a temperature close to 2.1 K. The sample was 20 × 10 × 10 mm 3 and had a Pr 3+ concentration of 0.05% which gives an absorption depth in the range 60 < d < 80 [33] at the center of the inhomogeneous profile. The high absorption was critical in order to obtain highly absorbing peaks (see Sec.…”

Section: Methodsmentioning

confidence: 99%

“…However, in rare-earth-metal-ion-doped crystals the inhomogeneous absorption profile can indeed be efficiently manipulated, providing the flexibility needed to meet all those requirements. This flexibility is useful not only for AFC, but also for many other similar experiments, such as electromagnetically induced transparency (EIT) [36], slow light [33] or quantum computing [37,38]. Since the precise control of the absorption structure is of particular concern for this paper, we will here make a detailed description of how to create a test platform for AFC experiments and essentially the same technique can be used also for the other listed experiments mentioned above.…”

Section: Preparation Of Afcmentioning

confidence: 99%

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Towards an efficient atomic frequency comb quantum memory

Amari

Walther

Sabooni

et al. 2010

Journal of Luminescence

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We present an efficient photon-echo experiment based on atomic frequency combs [Phys. Rev. A 79, 052329 (2009)]. Echoes containing an energy of up to 35% of that of the input pulse are observed in a Pr 3+ -doped Y 2 SiO 5 crystal. This material allows for the precise spectral holeburning needed to make a sharp and highly absorbing comb structure. We compare our results with a simple theoretical model with satisfactory agreement. Our results show that atomic frequency combs has the potential for high-efficiency storage of single photons as required in future long-distance communication based on quantum repeaters.

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Afcmentioning

confidence: 99%

Towards an efficient atomic frequency comb quantum memory

Amari

Walther

Sabooni

et al. 2010

Journal of Luminescence

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“…[37,38], the variation of the emitted bandwidth À due to collectively enhanced decay can be modeled with the relation À ¼ À 0 ð1 þ NÞ, with the natural linewidth À 0 ¼ 2 Â 5:8 MHz of the 5P 1=2 , [39], the atom number N, and a geometry factor . We also find a linear increase of À with OD m compatible with this model, since N is proportional to our measured OD m ; the solid line in Fig.…”

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confidence: 99%

Narrow Band Source of Transform-Limited Photon Pairs via Four-Wave Mixing in a Cold Atomic Ensemble

et al. 2013

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We observe narrow band pairs of time-correlated photons of wavelengths 776 and 795 nm from nondegenerate four-wave mixing in a laser-cooled atomic ensemble of ^{87}Rb using a cascade decay scheme. Coupling the photon pairs into single mode fibers, we observe an instantaneous rate of 7700 pairs per second with silicon avalanche photodetectors, and an optical bandwidth below 30 MHz. Detection events exhibit a strong correlation in time [g((2))(τ = 0) ≈ 5800] and a high coupling efficiency indicated by a pair-to-single ratio of 23%. The violation of the Cauchy-Schwarz inequality by a factor of 8.4 × 10(6) indicates a strong nonclassical correlation between the generated fields, while a Hanbury Brown-Twiss experiment in the individual photons reveals their thermal nature. The comparison between the measured frequency bandwidth and 1/e decay time of g((2)) indicates a transform-limited spectrum of the photon pairs. The narrow bandwidth and brightness of our source makes it ideal for interacting with atomic ensembles in quantum communication protocols.

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“…In the case where the group velocity reduction is mainly caused by the spectral hole burning in an absorption profile such as our case here, the group velocity, v g , can be approximately calculated by [15,20,21],…”

Section: Group Velocitymentioning

confidence: 99%

Using electric fields for pulse compression and group-velocity control

Kinos

Thuresson

et al. 2017

Phys. Rev. A

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In this article, we experimentally demonstrate a new way of controlling the group velocity of an optical pulse by using a combination of spectral hole burning, slow light effect and linear Stark effect in a rare-earth-ion-doped crystal. The group velocity can be changed continuously by a factor of 20 without significant pulse distortion or absorption of the pulse energy. With a similar technique, an optical pulse can also be compressed in time. Theoretical simulations were developed to simulate the group velocity control and the pulse compression processes. The group velocity as well as the pulse reshaping are solely controlled by external voltages which makes it promising in quantum information and quantum communication processes. It is also proposed that the group velocity can be changed even more in an Er doped crystal while at the same time having a transmission band matching the telecommunication wavelength.

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Experimental superradiance and slow-light effects for quantum memories

Cited by 34 publications

References 36 publications

Towards an efficient atomic frequency comb quantum memory

Towards an efficient atomic frequency comb quantum memory

Narrow Band Source of Transform-Limited Photon Pairs via Four-Wave Mixing in a Cold Atomic Ensemble

Using electric fields for pulse compression and group-velocity control

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