Collective excitation and photon entanglement in double- $\sf \Lambda $ atomic ensemble

Liu, Z. J.; Wang, Yan; Zhou, Ling

doi:10.1140/epjd/e2009-00323-2

“…as a resource for quantum information processing [2]. We determine the c-numbers α nk , β nk and γ nk by inserting ( 22) into (11) and make use of (21). This leads to three self-consistency equations that we can represent in the basis…”

Section: †mentioning

confidence: 99%

“…DSPs in more sophisticated schemes have been studied, e.g. double- [9][10][11], dual-V [12], inverted-Y [13], four-level [14], tripod [15], M-type [16], cyclic three-level [17] and multi- [18,19]. Collapses and revivals of the DSP number in an atomic ensemble with ground state degeneracy were found in [20].…”

Section: Introductionmentioning

confidence: 99%

Dark-state polaritons in a degenerate two-level system

Maggitti

¹

,

Radonjić²,

Jelenković³

2013

Laser Phys.

2

0

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We investigate the formation of dark-state polaritons in an ensemble of degenerate two-level atoms admitting electromagnetically induced transparency. Using a generalization of microscopic equation-of-motion technique, multiple collective polariton modes are identified depending on the polarizations of two coupling fields. For each mode, the polariton dispersion relation and composition are obtained in a closed form out of a matrix eigenvalue problem for arbitrary control field strengths. We illustrate the algorithm by considering the F g = 2 → F e = 1 transition of the D 1 line in 87 Rb atomic vapor. In addition, an application of dark-state polaritons to the frequency and/or polarization conversion, using D 1 and D 2 transitions in cold Rb atoms, is given.

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“…However, the storage of a two-color quantum entangled state would be interesting because it would have potential applications in future quantum information networks, e.g., they could be used to link systems of different nature [32,33]. One of the main issues regarding two-color memories, both in quantum and in classical approaches, is that the existence of a dark state in resonant double-systems [34,35] together with the presence of four-wave mixing processes lead to a pulse matching of the frequency components [36]. This implies that the two input frequency modes cannot be independently stored [26].…”

Section: Introductionmentioning

confidence: 99%

Two-color lasing in cold atoms

Wu

¹

,

Artoni

²

,

Rocca

³

2013

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We propose a quantum memory for a single-photon wave packet in a superposition of two different colors, i.e., two different frequency components, using the electromagnetically induced transparency technique in a double-system. We examine a specific configuration in which the two frequency components are able to exchange energy through a four-wave mixing process as they propagate, so the state of the incident photon is recovered periodically at certain positions in the medium. We investigate the propagation dynamics as a function of the relative phase between the coupling beams and the input single-photon frequency components. Moreover, by considering time-dependent coupling beams, we numerically simulate the storage and retrieval of a two-frequency-component single-photon qubit.

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“…However, the storage of a two-color quantum entangled state would be interesting because it would have potential applications in future quantum information networks, e.g., they could be used to link systems of different nature [32,33]. One of the main issues regarding two-color memories, both in quantum and in classical approaches, is that the existence of a dark state in resonant double-Λ systems [34,35] together with the presence of four-wave mixing processes lead to a pulse matching of the frequency components [36]. This implies that the two input frequency modes can not be independently stored [26].…”

Section: Introductionmentioning

confidence: 99%

Two-color quantum memory in double-Λmedia

Viscor

¹

,

Ahufinger

²

,

Mompart

³

et al. 2012

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We propose a quantum memory for a single-photon wave packet in a superposition of two different colors, i.e., two different frequency components, using the electromagnetically induced transparency technique in a double-system. We examine a specific configuration in which the two frequency components are able to exchange energy through a four-wave mixing process as they propagate, so the state of the incident photon is recovered periodically at certain positions in the medium. We investigate the propagation dynamics as a function of the relative phase between the coupling beams and the input single-photon frequency components. Moreover, by considering time-dependent coupling beams, we numerically simulate the storage and retrieval of a two-frequency-component single-photon qubit.

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Collective excitation and photon entanglement in double- $\sf \Lambda $ atomic ensemble

Cited by 6 publications

References 27 publications

Dark-state polaritons in a degenerate two-level system

Dark-state polaritons in a degenerate two-level system

Two-color lasing in cold atoms

Two-color quantum memory in double-Λmedia

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