Efficiency optimization for atomic frequency comb storage

Bonarota, M.; Ruggiero, J.; Gouët, J.-L. Le; Chanelière, Thierry

doi:10.1103/physreva.81.033803

Cited by 83 publications

(140 citation statements)

References 32 publications

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“…Additionally, it has been shown that the shape of each peak is very important to limit this intrinsic dephasing [28]. The highest efficiency for a given optical depth d is obtained for square peaks [29], where the intrinsic dephasing is given by sinc 2 (π/F ). The echo efficiency can then be written as…”

Section: A Afc Echo Delay Memorymentioning

confidence: 99%

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Towards highly multimode optical quantum memory for quantum repeaters

et al. 2016

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Long-distance quantum communication through optical fibers is currently limited to a few hundreds of kilometres due to fiber losses. Quantum repeaters could extend this limit to continental distances. Most approaches to quantum repeaters require highly multimode quantum memories in order to reach high communication rates. The atomic frequency comb memory scheme can in principle achieve high temporal multimode storage, without sacrificing memory efficiency. However, previous demonstrations have been hampered by the difficulty of creating high-resolution atomic combs, which reduces the efficiency for multimode storage. In this article we present a comb preparation method that allows one to increase the multimode capacity for a fixed memory bandwidth. We apply the method to a 151 Eu 3+ -doped Y 2 SiO 5 crystal, in which we demonstrate storage of 100 modes for 51 μs using the AFC echo scheme (a delay-line memory) and storage of 50 modes for 0.541 ms using the AFC spin-wave memory (an on-demand memory). We also briefly discuss the ultimate multimode limit imposed by the optical decoherence rate, for a fixed memory bandwidth.

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Section: A Afc Echo Delay Memorymentioning

confidence: 99%

“…To create an AFC profile with squarish peaks, one method is to burn each spectral hole one after the other by using sechyp pulses in series [29]. The central frequency of each pulse is then detuned by from the preceding pulse.…”

Section: Shaping Optimization Of the Afcmentioning

confidence: 99%

Towards highly multimode optical quantum memory for quantum repeaters

et al. 2016

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“…The finesse of the comb used here is 2 as this gives the highest storage efficiency. 18 The experimental setup for creating and characterising the AFCs is shown in Fig. 2 There are three parts to the experiment; repumping, comb creation, and echo measurement.…”

mentioning

confidence: 99%

Using quantum memory techniques for optical detection of ultrasound

McAuslan¹,

Taylor²,

Longdell³

2012

Appl. Phys. Lett.

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“…This could lead to the overestimation of the peak width and, consequently, of the theoretical AFC efficiency due to a suboptimal finesse. Note also that higher efficiencies could be reached by tailoring square AFC peaks [44].…”

Section: Memory Characterizationmentioning

confidence: 99%

Quantum Storage of Heralded Single Photons in a Praseodymium-Doped Crystal

et al. 2014

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We report on experiments demonstrating the reversible mapping of heralded single photons to long lived collective optical atomic excitations stored in a Pr 3+ :Y2SiO5 crystal. A cavity-enhanced spontaneous down-conversion source is employed to produce widely non-degenerate narrow-band (≈ 2 MHz) photon-pairs. The idler photons, whose frequency is compatible with telecommunication optical fibers, are used to herald the creation of the signal photons, compatible with the Pr 3+ transition. The signal photons are stored and retrieved using the atomic frequency comb protocol. We demonstrate storage times up to 4.5 µs while preserving non-classical correlations between the heralding and the retrieved photon. This is more than 20 times longer than in previous realizations in solid state devices, and implemented in a system ideally suited for the extension to spin-wave storage.PACS numbers: 03.67. Hk,42.50.Gy,42.50.Md Many protocols in quantum information science rely on the efficient and reversible interaction between photons and matter [1]. The interaction lays the basis for the realization of quantum memories for light and of their application, e.g. in quantum repeaters [2,3]. Possible choices for the system used to store light are single atoms in cavities [4], cold or hot atomic gases [5-13], or rare earth (RE) doped solid state systems [14]. Thanks to the weak interaction between the optical active ions and the environment, RE doped crystals offer, when cryogenically cooled, the long optical and spin coherence times typical of atomic systems, free of the drawbacks deriving from atomic motion [15]. Moreover they possess the benefits of the solid state systems, such as strong interaction with light, allowing for efficient storage of photons [16,17] and prospect for integrated devices. Furthermore, their inhomogeneously broadened absorption lines can be tailored in appropriate structures, like atomic frequency combs (AFCs), to enable storage protocols with remarkable properties (e.g. temporal or frequency multiplexing) [18][19][20][21][22][23][24].Single photon level weak coherent pulses [25,26] and qubits [18,27,28] have been stored in the excited state of rare-earth doped crystals using the AFC scheme. This has recently been extended to the ground state, in the regime of a few photons per pulse [29]. The storage of non-classical light generated by spontaneous parametric down-conversion (SPDC) has also been demonstrated and enabled entanglement between one photon and one collective optical atomic excitation in a crystal [30,31], entanglement between two crystals [32], and single photon qubit storage [33,34]. However, the mapping of nonclassical light using AFC in rare earth doped crystals was obtained so far only in systems with two ground state levels, thus inherently limited to the optical coherence and not directly extendable to spin-wave storage.On the contrary, Pr 3+ or Eu 3+ doped crystals have the required level structure for spin-wave storage [22,23,29].In particular, Pr 3+ :Y 2 SiO 5 is one of the optical ...

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Efficiency optimization for atomic frequency comb storage

Cited by 83 publications

References 32 publications

Towards highly multimode optical quantum memory for quantum repeaters

Towards highly multimode optical quantum memory for quantum repeaters

Using quantum memory techniques for optical detection of ultrasound

Quantum Storage of Heralded Single Photons in a Praseodymium-Doped Crystal

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