Coherent response to optical excitation in a strongly absorbing rare-earth ion-doped crystal

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

doi:10.1364/josab.27.000032

Cited by 9 publications

(15 citation statements)

References 26 publications

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“…Moreover, when propagating through a broadband absorber, a π-pulse converts most of its energy into atomic excitation. According to the numerical solution of Maxwell-Bloch equations [29], 50% of a rectangular π-pulse is absorbed at depth z = 1.78/α. As a consequence, the pulse undergoes strong distortions.…”

Section: Optimizing the Rephasing Stepmentioning

confidence: 99%

Revival of silenced echo and quantum memory for light

et al. 2011

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We propose an original quantum memory protocol. It belongs to the class of rephasing processes and is closely related to two-pulse photon echo. It is known that the strong population inversion produced by the rephasing pulse prevents the plain two-pulse photon echo from serving as a quantum memory scheme. Indeed gain and spontaneous emission generate prohibitive noise. A second π-pulse can be used to simultaneously reverse the atomic phase and bring the atoms back into the ground state. Then a secondary echo is radiated from a non-inverted medium, avoiding contamination by gain and spontaneous emission noise. However, one must kill the primary echo, in order to preserve all the information for the secondary signal. In the present work, spatial phase mismatching is used to silence the standard two-pulse echo. An experimental demonstration is presented.

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Section: Optimizing the Rephasing Stepmentioning

confidence: 99%

Revival of silenced echo and quantum memory for light

et al. 2011

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“…and = ω ab − ω 0 . The dynamics of B in frame R given by (8) are much simpler than in frame R. Indeed, in R and under the RWA, the fast oscillatory behaviour of the control vector has been ruled out. What is left is just its smooth variation as (t) andφ(t) evolve during the ARP.…”

Section: One Adiabatic Rapid Passagementioning

confidence: 99%

“…Then the use of optical π pulses is even more problematic. Indeed an optical pulse is distorted as it propagates through the sample because of light absorption [8]. As a consequence, the pulse area is no longer π after some threshold depth in the sample, not to mention the transverse variation of intensity that alters the pulse area uniformity across the light beam.…”

Section: Introductionmentioning

confidence: 99%

Securing coherence rephasing with a pair of adiabatic rapid passages

et al. 2013

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Coherence rephasing is an essential step in quantum storage protocols that use echo-based strategies. We present a thorough analysis on how two adiabatic rapid passages (ARPs) are able to rephase atomic coherences in an inhomogeneously broadened ensemble. We consider both optical and spin coherences, rephased by optical or radio-frequency (rf) ARPs, respectively. We show how a rephasing sequence consisting of two ARPs in a double-echo scheme is equivalent to the identity operator (any state can be recovered), as long as certain conditions are fulfilled. Our mathematical treatment of the ARPs leads to a very simple geometrical interpretation within the Bloch sphere that permits a visual comprehension of the rephasing process. We also identify the conditions that ensure the rephasing, finding that the phase of the optical or rf ARP fields plays a key role in the ability of the sequence to preserve the phase of the superposition state. This settles a difference between optical and rf ARPs, since field phase control is not readily guaranteed in the former case. We also provide a quantitative comparison between π -pulse and ARP rephasing efficiencies, showing the superiority of the latter. We experimentally verify the conclusions of our analysis through rf ARP rephasing sequences performed on the rare-earth ion-doped crystal Tm 3+ :YAG, of interest in quantum memories.

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“…For this data series, αL = 0.15. in noise. The ability to apply accurate π pulses has already received careful study [24,25]. Semiclassical 1D numerical calculations, presented in Fig.…”

Section: Discussion and Classical Simulationmentioning

confidence: 99%

Photon-echo quantum memories in inhomogeneously broadened two-level atoms

et al. 2011

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Here, we propose a solid-state quantum memory that does not require spectral holeburning, instead using strong rephasing pulses like traditional photon-echo techniques. The memory uses external broadening fields to reduce the optical depth and so switch off the collective atom-light interaction when desired. The proposed memory should allow operation with reasonable efficiency in a much broader range of material systems, for instance Er 3+ doped crystals which have a transition at 1.5 μm. We present analytic theory supported by numerical calculations and initial experiments.

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Coherent response to optical excitation in a strongly absorbing rare-earth ion-doped crystal

Cited by 9 publications

References 26 publications

Revival of silenced echo and quantum memory for light

Revival of silenced echo and quantum memory for light

Securing coherence rephasing with a pair of adiabatic rapid passages

Photon-echo quantum memories in inhomogeneously broadened two-level atoms

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