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BIMA JOURNAL OF SCIENCE AND TECHNOLOGY GOMBE

STUDY OF STORAGE AND RETRIEVAL OF SINGLE-PHOTON QUANTUM STATE IN A COLLECTIVE ATOMIC EXCITATIONS

I.I. BABAYO, A.M LIMAN, Azmirah Ahmed

Published Jun 13, 2021• 0 citations
Publisher

Abstract

In this article, the probe pulse (that is, of single-photon quantum states) which can be stored in longlive cavity dark state is investigated. The transfer of the single photon state to the collective cavitydark state can be accomplished with nearly a hundred percent efficiently by the method ofintracavity EIT and assumption of quantum impedance matching condition whereby the classicaldriving field is adiabatically switched off while the probe laser is inside the dense ensemble of atomsand cos θ is optimized for any input pulse respectively is clearly described. It is noted that, thismethod of using an optically-dense many-atom medium is far superior and efficient than the techniquewith single atoms processed in the strong coupling system.

DOI
10.64290/bima.v5i01.274

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In this article, the probe pulse (that is, of single-photon quantum states) which can be stored in longlive cavity dark state is investigated. The transfer of the single photon state to the collective cavitydark state can be accomplished with nearly a hundred percent efficiently by the method ofintracavity EIT and assumption of quantum impedance matching condition whereby the classicaldriving field is adiabatically switched off while the probe laser is inside the dense ensemble of atomsand cos θ is optimized for any input pulse respectively is clearly described. It is noted that, thismethod of using an optically-dense many-atom medium is far superior and efficient than the techniquewith single atoms processed in the strong coupling system.
In this article, the probe pulse (that is, of single-photon quantum states) which can be stored in longlive cavity dark state is investigated. The transfer of the single photon state to the collective cavitydark state can be accomplished with nearly a hundred percent efficiently by the method ofintracavity EIT and assumption of quantum impedance matching condition whereby the classicaldriving field is adiabatically switched off while the probe laser is inside the dense ensemble of atomsand cos θ is optimized for any input pulse respectively is clearly described. It is noted that, thismethod of using an optically-dense many-atom medium is far superior and efficient than the techniquewith single atoms processed in the strong coupling system.
We show that it is possible to "store" quantum states of single-photon fields by mapping them onto collective meta-stable states of an optically dense, coherently driven medium inside an optical resonator. An adiabatic technique is suggested which allows to transfer non-classical correlations from traveling-wave single-photon wave-packets into atomic states and vise versa with nearly 100% efficiency. In contrast to previous approaches involving single atoms, the present technique does not require the strong coupling regime corresponding to high-Q micro-cavities. Instead, intracavity Electromagnetically Induced Transparency is used to achieve a strong coupling between the cavity mode and the atoms.
We theoretically analyze the efficiency of a quantum memory for single photons. The photons propagate along a transmission line and impinge on one of the mirrors of a high-finesse cavity. The quantum memory is constituted by a single atom within the optical resonator. Photon storage is realized by the controlled transfer of the photonic excitation into a metastable state of the atom and occurs via a Raman transition with a suitably tailored laser pulse, which drives the atom. Our study is supported by numerical simulations, in which we include the modes of the transmission line and we use the experimental parameters of existing experimental setups. It reproduces the results derived using input–output theory in the corresponding regimes and can be extended to compute dynamics where the input–output formalism cannot be straightforwardly applied. Our analysis determines the maximal storage efficiency, namely, the maximal probability to store the photon in a stable atomic excitation, in the presence of spontaneous decay and cavity parasitic losses. It further delivers the form of the laser pulse that achieves the maximal efficiency by partially compensating parasitic losses. We numerically assess the conditions under which storage based on adiabatic dynamics is preferable to non-adiabatic pulses. Moreover, we systematically determine the shortest photon pulse that can be efficiently stored as a function of the system parameters.
We propose to couple single atomic qubits to photons incident on a cavity containing an atomic ensemble of a different species that mediates the coupling via Rydberg interactions. Subject to a classical field and the cavity field, the ensemble forms a collective dark state which is resonant with the input photon, while excitation of a qubit atom leads to a secondary ``dark'' state that splits the cavity resonance. The two different dark-state mechanisms yield zero and $\ensuremath{\pi}$ reflection phase shifts and can be used to implement quantum gates between atomic and optical qubits.
Abstract Attenuated laser pulses are often employed in place for single photons in order to test the efficiency of the elements of a quantum network. In this work we analyze theoretically the dynamics of storage of an attenuated light pulse (where the pulse intensity is at the single photon level) propagating along a transmission line and impinging on the mirror of a high finesse cavity. Storage is realized by the controlled transfer of the photonic excitations into a metastable state of an atom confined inside the cavity and occurs via a Raman transition with a suitably tailored laser pulse, which drives the atom and minimizes reflection at the cavity mirror. We determine the storage efficiency of the weak coherent pulse which is reached by protocols optimized for single-photon storage. We determine the figures of merit and we identify the conditions on an arbitrary pulse for which the storage dynamics approaches the one of a single photon. Our formalism can be extended to arbitrary types of input pulses and to quantum memories composed by spin ensembles, and serves as a basis for identifying the optimal protocols for storage and readout.
We present a scheme for the quantum storage of single photons using electromagnetically induced transparency (EIT) in a low-finesse optical cavity, assisted by state-selected spontaneous atomic emission. Mediated by the dark mode of cavity EIT, the destructive quantum interference between the cavity input–output channel and state-selected atomic spontaneous emission leads to strong absorption of single photons with unknown arrival time and pulse shapes. We discuss the application of this phenomenon to photon counting using stored light.