Storage and reconstruction of quantum information using exciton resonance in a solid

Gazazyan, A. D.; Gazazyan, E. A.

doi:10.1134/s1054660x06120164

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…used for explanation of asymmetry in the absorption impurity ions in crystals, which is caused by for formation of excitonic resonances [16,17]. With use of these resonances works [18,19], study the phenomenon of storage and reconstruction of quantum information in solids. The asymmetric form of the Fano resonance is important in considerations of nanoscale structures of interacting quantum systems [20,21].…”

Section: Introductionmentioning

confidence: 99%

Formation and stimulated photodissociation of metastable molecules with emission of photon at the collision of two atoms in a laser radiation field

Gazazyan¹,

Gazazyan²

2017

Laser Phys.

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Abstract. The Formation of metastable molecules (Feshbach resonances) at the collision of two atoms and subsequent stimulated transition to a lower unbound electronic molecular state, with emission of a photon of the laser radiation has been investigated. This can develop, in particular, for Rb 2 molecules due to resonance scattering of two Rb atoms. The considered process is a basis for the creation of excimer lasers. Expressions for the cross sections of elastic and inelastic resonance scattering and the intensity of the stimulated emission of the photons have been obtained.

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Section: Introductionmentioning

confidence: 99%

Formation and stimulated photodissociation of metastable molecules with emission of photon at the collision of two atoms in a laser radiation field

Gazazyan¹,

Gazazyan²

2017

Laser Phys.

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“…It is, e.g., used for explanation of asymmetry in the absorption spectra of impurity ions in crystals, which is caused by formation of excitonic resonances [27]. With use of these resonances work [28] studies the phenomenon of storage and reconstruction of quantum information in solids. We note that many researchers call the above-mentioned Feshbach resonances Fano-Feshbach resonances.…”

Section: Introductionmentioning

confidence: 99%

Influence of external magnetic and laser radiation fields on Feshbach resonances in collision of atoms

Gazazyan,

Chaltykyan

2012

Preprint

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With use of Fano technique, we study collision of two atoms with formation of Feshbach resonance at combined interaction with the external magnetic field and laser radiation. In cases of one-and two-photon resonances of laser radiation with two discrete vibrational molecular levels, we show that Feshbach resonances appear at interaction of external magnetic field with dressed states formed via Autler-Townes effect. In addition, in case of one-photon resonance the lower vibrational molecular state is coupled by laser radiation with the continuum of the elastic channel and forms laser-induced Feshbach resonance via both Autler-Townes effect and LICS mechanism. We study the combined process of formation of Feshbach resonances; this enables the control of Feshbach resonance by varying the magnetic field and intensity and frequency of laser radiation. We also study the laserinduced inelastic collision and its influence on the considered processes. In case of two-photon resonance between discrete vibrational molecular states the Feshbach resonances arise under action of magnetic field via Autler-Townes effect, while the laser-induced transition into the elastic-channel continuum is in this case absent. We obtain the cross-sections of elastic and inelastic scattering and show that quenching of resonance occurs at the energy equal to that of the systems ground state. Dependence of the cross-sections on the magnetic field and laser intensity is examined in detail. In all considered cases, the scattering length is obtained and its dependence on the magnetic and laser fields is studied. In the absence of magnetic interaction if the hyperfine substates of the quasibound state in the closed channel and those of individual colliding atoms in the open channel are the same, Feshbach resonances may arise via weak interaction between nuclear and electronic motions, which leads to transitions between electronic states. The obtained results can be employed in new studies of collisions of cold atoms, e.g., of alkali metal atoms and for interpretation of new experiments in BECs.

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“…In previous paper [19] the possibility was shown for the storage and reconstruction of quantum information in the case of one isolated exciton resonance with assumption that the Fano parameters are equal, while the two-photon detuning and decay rate between the lower levels (decoherence) are zero. It was demonstrated that the shape and quantum state of the light pulse are preserved in the course of its propagation and reconstruction.…”

Section: Introductionmentioning

confidence: 99%

Quantum memory for photons in case of many close lying exciton resonances in solids

Gazazyan

Margaryan

2009

Eur. Phys. J. D

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Abstract. The possibility of storage of quantum information with photons is studied in the case of resonant transitions via many close lying exciton levels in a solid with impurity Λ-atoms. The upper levels of the impurity atom form resonant Fano states, similar to the autoionization atomic states, due to the configuration interaction with the continuum of the exciton band. In this case slowing of light pulses is shown to be realistic, in the presence of the control field, down to the group velocity much lower than that in vacuum. The possibility of storage and reconstruction of a quantum pulse is studied in the case of the instantaneous switching on/off of the control field. It is shown that the signal quantum pulse cannot be stored undistorted for differing values of Fano parameters and for non-zero two-photon detuning and decay rate between the lower levels (decoherence). However, for small difference of the Fano parameters and for small values of the two-photon detuning and the decoherence there is no distortion in the case where the length of the pulse is much longer than the linear absorption (amplification) length, so the shape and quantum state of the light pulse can be restored. PACS. 32.80.Qk Coherent control of atomic interactions with photon -42.50. Gy Effects of atomic on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption. .

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Storage and reconstruction of quantum information using exciton resonance in a solid

Cited by 6 publications

References 20 publications

Formation and stimulated photodissociation of metastable molecules with emission of photon at the collision of two atoms in a laser radiation field

Formation and stimulated photodissociation of metastable molecules with emission of photon at the collision of two atoms in a laser radiation field

Influence of external magnetic and laser radiation fields on Feshbach resonances in collision of atoms

Quantum memory for photons in case of many close lying exciton resonances in solids

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