Stokes Amplification Regimes in Quasi-cw Pumped Hydrogen-Filled Hollow-Core Photonic Crystal Fiber

Benabid, Fetah; Antonopoulos, G.; Knight, Jonathan C.; Russell, P. St. J.

doi:10.1103/physrevlett.95.213903

Cited by 62 publications

(23 citation statements)

References 13 publications

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“…This makes the filtering of unwanted light much harder, since the required total power has to be increased. A better way might be to put the atoms in a hollow fiber [25], which can also be used to guide the read and write light. The atoms are then kept in the laser beam by collisions with the walls, and one can refrain from using buffer gas at all.…”

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confidence: 99%

Collisional decoherence during writing and reading quantum states

et al. 2007

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Collisions, even though they do not limit the lifetime of quantum information stored in ground state hyperfine coherences, they may severely limit the fidelity for quantum memory when they happen during the write and read process. This imposes restrictions on the implementation of Raman type quantum processes in thermal vapor cells and their performance as a quantum memory. We study the effect of these collisions in our experiment.PACS numbers: 32.80. Qk , 03.67.Hk, 03.65.Yz In recent years, significant experimental advances have been achieved in the field of quantum communication (QC) [1,2]. However, photon loss and detector noise limit direct QC to moderate distances (up to 100 km in quantum cryptography). In 2001, Duan, Lukin, Cirac and Zoller (DLCZ) proposed a practical quantum repeater [3,4] based on writing and reading single excitations in atomic ensembles using Raman type processes. A joint projective measurement of individual photons emitted from two separated atomic ensembles leads to qubittype entanglement of collective excitations in both ensembles, which combined with entanglement swapping [5] and entanglement purification [6] allows to create entanglement over (arbitrary) long distances. Essential to the scalability of the DLCZ scheme are the long lived collective excitations, which represent a quantum memory. Without such quantum memory, the overhead scales exponentially with the channel length.Although entanglement swapping [7] and entanglement purification [8] have been experimentally demonstrated with linear optics, it is difficult to achieve the high fidelity quantum memory. Significant experimental advances have been made to implement the DLCZ-scheme [3] both with ultra-cold atomic clouds [9,10,11,12,13,14] and hot vapors in buffer gas cells [15,16,17]. While ultracold ensembles require substantial technological effort, vapor cells provide comparatively easy experimental access. Moreover atomic clock experiments have shown that with the correct coating of cell walls and the use of buffer gas the ground state coherence can be preserved for up to > 10 8 collisions [18] leading to very narrow line widths.In this paper, we demonstrate however that the mapping process between light fields and atomic coherence is strongly influenced by collisions. This severely limits the fidelity of the DLCZ-scheme and a quantum memory in hot atomic ensembles.The mapping process between light fields and atomic coherence is essential to the DLCZ scheme [3]. Single excitations are written in an atomic ensemble Raman transitions in a three level λ-configuration: (ground states FIG. 1: (color online) a) Experimental setup: Two control lasers (write and read) are combined at a Wollastone prism (WP) and intersect inside a magnetically shielded 87 Rb vapor cell with Neon buffer gas. The weak signal fields (Stokes and Anti-Stokes) are separated from the control beams at a second polarizer. After spectral filtering, the signal photons are detected by fiber coupled avanlanche photo diode (APD). b) Simplified level sche...

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confidence: 99%

Collisional decoherence during writing and reading quantum states

et al. 2007

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“…For laser pulses shorter than τ 1 ~1/gzΓs, The Stokes amplification is due to spontaneous Raman scattering and is independent of the pulse duration. For pulses longer than τ 1 ~1/gzΓ and shorter than τ 2 , the scattering regime is stimulated and transient and the energy threshold for SRS E th is quadratic with regard to the pulse duration τ as [4]:…”

Section: Raman Scattering Regime In Hc-pcfmentioning

confidence: 99%

“…The combination of a long interaction length z and a high confinement of light in a small effective area A eff achieved in these fibers has lead to the observation of quasi-CW SRS where the Raman transient regime extended to pulses longer than 14ns [4]. According to the theory in reference [5], the threshold pulse width τ 2 below which transient SRS occurs at τ 2~g z/Γ, where g is the Raman coefficient gain and Γ the Raman half-linewidth.…”

Section: Introductionmentioning

confidence: 98%

“…Hydrogen-filled hollow core photonic crystal fiber (HC-PCF) has proven extremely efficient for the generation of stimulated Raman scattering (SRS) in gaseous media [1][2][3][4]. The combination of a long interaction length z and a high confinement of light in a small effective area A eff achieved in these fibers has lead to the observation of quasi-CW SRS where the Raman transient regime extended to pulses longer than 14ns [4].…”

Section: Introductionmentioning

confidence: 99%

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Control of the Transient Regime of Stimulated Raman Scattering in Hollow-Core Photonic Crystal Fiber

Couny

Benabid

Light

2007

2007 Conference on Lasers and Electro-Optics (CLEO)

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“…In particular, optical sources based on stimulated rotational Raman scattering, and sensitive absorption measurements in HC-PBFs have been reported [4,[19][20][21][22]. Stimulated Raman scattering in HC-PBFs depends on the enhanced gain possible in the fiber's confined volume.…”

Section: Related Work In Hc-pbfsmentioning

confidence: 99%

Enhanced spontaneous Raman scattering and gas composition analysis using a photonic crystal fiber

et al. 2008

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Spontaneous gas-phase Raman scattering using a hollow-core photonic bandgap fiber (HC-PBF) for both the gas cell and the Stokes light collector is reported. It was predicted that the HC-PBF configuration would yield several hundred times signal enhancement in Stokes power over a traditional free-space configuration because of increased interaction lengths and large collection angles. Predictions were verified by using nitrogen Stokes signals. The utility of this system was demonstrated by measuring the Raman signals as functions of concentration for major species in natural gas. This allowed photomultiplier-based measurements of natural gas species in relatively short integration times, measurements that were previously difficult with other systems.

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Stokes Amplification Regimes in Quasi-cw Pumped Hydrogen-Filled Hollow-Core Photonic Crystal Fiber

Cited by 62 publications

References 13 publications

Collisional decoherence during writing and reading quantum states

Collisional decoherence during writing and reading quantum states

Control of the Transient Regime of Stimulated Raman Scattering in Hollow-Core Photonic Crystal Fiber

Enhanced spontaneous Raman scattering and gas composition analysis using a photonic crystal fiber

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