Demonstration of 8-Gbit/in^2 areal storage density based on swept-carrier frequency-selective optical memory

Lin, Haifeng; Wang, Tsaipei; Mossberg, T. W.

doi:10.1364/ol.20.001658

Cited by 104 publications

(58 citation statements)

References 21 publications

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“…The protocols and the material should intrinsically offer a broad interaction linewidth. Inspired by impressive realizations in the classical domain [2,3], the photon-echo techniques in rare-earth-ion doped crystals (REIC) appear as a prime alternative.…”

Section: Introductionmentioning

confidence: 99%

Efficiency optimization for atomic frequency comb storage

et al. 2010

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We study the efficiency of the Atomic Frequency Comb storage protocol. We show that for a given optical depth, the preparation procedure can be optimize to significantly improve the retrieval. Our prediction is well supported by the experimental implementation of the protocol in a Tm 3+ :YAG crystal. We observe a net gain in efficiency from 10% to 17% by applying the optimized preparation procedure. In the perspective of high bandwidth storage, we investigate the protocol under different magnetic fields. We analyze the effect of the Zeeman and superhyperfine interaction.

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Section: Introductionmentioning

confidence: 99%

Efficiency optimization for atomic frequency comb storage

et al. 2010

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“…The echo approach lends itself naturally to the storage of many temporal modes. Storage and retrieval of up to 1760-pulse sequences has been demonstrated [15]. The temporal information is stored in the relative phases of atomic excitations at different frequencies.…”

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confidence: 99%

Quantum Repeaters with Photon Pair Sources and Multimode Memories

et al. 2007

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We propose a quantum repeater protocol which builds on the well-known DLCZ protocol [L.M. Duan, M.D. Lukin, J.I. Cirac, and P. Zoller, Nature 414, 413 (2001)], but which uses photon pair sources in combination with memories that allow to store a large number of temporal modes. We suggest to realize such multi-mode memories based on the principle of photon echo, using solids doped with rare-earth ions. The use of multimode memories promises a speedup in entanglement generation by several orders of magnitude and a significant reduction in stability requirements compared to the DLCZ protocol.The distribution of entanglement over long distances is an important challenge in quantum information. It would extend the range for tests of Bell's inequalities, quantum key distribution and quantum networks. [5,6]. A basic element of all protocols is the creation of entanglement between neighboring nodes A and B, typically conditional on the outcome of a measurement, e.g. the detection of one or more photons at a station between two nodes. In order to profit from a nested repeater protocol [1], the entanglement connection operations creating entanglement between non-neighboring nodes can only be performed once one knows the relevant measurement outcomes. This requires a communication time of order L 0 /c, where L 0 is the distance between A and B. Conventional repeater protocols are limited to a single entanglement generation attempt per elementary link per time interval L 0 /c. Here we propose to overcome this limitation using a scheme that combines photon pair sources and memories that can store a large number of distinguishable temporal modes. We also show that such memories could be realized based on the principle of photon echo, using solids doped with rare-earth ions.Our scheme is inspired by the DLCZ protocol [2], which uses Raman transitions in atomic ensembles that lead to nonclassical correlations between atomic excitations and emitted photons [7]. The basic procedure for entanglement creation between two remote locations A and B in our protocol requires one memory and one source of photon pairs at each location, denoted M A(B) and S A(B) respectively. The two sources are coherently excited such that each has a small probability p/2 of creating a pair, corresponding to a stateHere a and a ′ (b and b ′ ) are the two modes corresponding to S A (S B ), φ A (φ B ) is the phase of the pump laser at location A (B), and |0 is the vacuum state. The O(p) term introduces errors in the protocol, leading to the requirement that p has to be kept small, cf. below. The photons in modes a and b are stored in the local memories M A and M B . The modes a ′ and b ′ are coupled into fibers and combined on a beam splitter at a station between A and B. The modes after the beam splitter, where χ A,B are the phases acquired by the photons on their way to the central station. Detection of a single photon inã, for example, creates a state, where a and b are now stored in the memories. This can be rewritten as an entangled state of the two m...

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“….r e 2i (t 2 −t 1 ) ), where k i , i = {1,3}, refers the ith pulse and the atomic density now depends on the spatial coordinate r. The exponential terms average to zero unless the phase-matching condition is fulfilled: k ≈ −k 1 + k 2 + k 3 . When the sample is small compared with λ 3 , the collective emission is isotropic and the signal-to-noise ratio (10) holds for any direction.…”

Section: Fluorescencementioning

confidence: 99%

“…Further, consider the case where the delay t 3 − t 2 between these Raman pulses is much longer than the phase relaxation time of the |1 -|3 transition, as before. Finally, at time t 4 > t 3 , a π pulse resonant with the transition |2 -|3 transfers back the spin coherence into an optical coherence. At time t 4 just after the interaction with this last π pulse, the state of the atom is described by a mixture of three states, …”

Section: Figmentioning

confidence: 99%

“…These techniques are naturally suited to store intense light pulses in multiple temporal modes. Storage and retrieval of up to 1760-pulse sequences has been demonstrated [3]. Furthermore, when the photon echo is generated with a specific sequence of three pulses, the so-called three-pulse photon echo, it further offers very long storage times, greater than the phase relaxation time, limited by the population relaxation time only [4].…”

Section: Introductionmentioning

confidence: 99%

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Impossibility of faithfully storing single photons with the three-pulse photon echo

et al. 2010

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The three-pulse photon echo is a well-known technique to store intense light pulses in an inhomogeneously broadened atomic ensemble. This protocol is attractive because it is relatively simple and it is well suited for the storage of multiple temporal modes. Furthermore, it offers very long storage times, greater than the phase relaxation time. Here, we consider the three-pulse photon echo in both two-and three-level systems as a potential technique for the storage of light at the single-photon level. By explicit calculations, we show that the ratio between the echo signal corresponding to a single-photon input and the noise is smaller than one. This severely limits the achievable fidelity of the quantum state storage, making the three-pulse photon echo unsuitable for single-photon quantum memory.

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Demonstration of 8-Gbit/in^2 areal storage density based on swept-carrier frequency-selective optical memory

Cited by 104 publications

References 21 publications

Efficiency optimization for atomic frequency comb storage

Efficiency optimization for atomic frequency comb storage

Quantum Repeaters with Photon Pair Sources and Multimode Memories

Impossibility of faithfully storing single photons with the three-pulse photon echo

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