Resonances and excitation pathways in four-level<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mtext>N</mml:mtext></mml:mrow></mml:mrow></mml:math>-scheme atomic systems

Abi-Salloum, Tony; Henry, Bryan R.; Davis, Jon P.; Narducci, Frank A.

doi:10.1103/physreva.82.013834

Cited by 25 publications

(32 citation statements)

References 20 publications

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“…Figure [2] is a plot of the group velocity of the probe field as a function of the switch field Rabi frequency, using the equations developed in 21 and also studied in. 22 This is very similar to the plot found in, 18 albeit for different parameters. We see a pole-like behavior below which the probe group velocity is slower than the vacuum speed of light and above which the group velocity is faster than the speed of light.…”

Section: Introductionsupporting

confidence: 85%

Dispersion in a four level N-scheme atomic system with co- and counter- propagating beams

Davis

Narducci

2012

Advances in Slow and Fast Light V

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We motivate the study of an 'N-scheme' atomic system for the case of a bi-directional probe field. We derive the equations of motion. The equations were expanded in order of the counter-propagating field strength over the co-propagating field strength. We solve the equations numerically in steady state in a perturbative manner. The zeroth order solutions describe the dispersion and absorption of the co-propagating field, while the first order solutions describe the dispersion and absorption of the counter-propagating field. We investigate the solutions in two temperature regimes for a variety of field strengths. Regimes of similar dispersion for the co-and counter-propagating fields were found, as well as regimes of opposite behavior. In most cases, absorption of the fields is still a problem.

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Section: Introductionsupporting

confidence: 85%

Dispersion in a four level N-scheme atomic system with co- and counter- propagating beams

Davis

Narducci

2012

Advances in Slow and Fast Light V

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“…Our investigation adds a fresh applications-based perspective to the ongoing discussion centered on phenomenon-based comparisons between EIT and ATS [4,5,[7][8][9][10][11]. Further, it clarifies any potential confusion that may arise between the two perceivably similar EIT and ATS memory protocols, which is important because by understanding the underlying mechanisms of these memories, a proper approach to optimization can be taken: one that yields the best results for a given set of technical and design limitations.…”

Section: Discussionmentioning

confidence: 99%

“…This common feature has been at the centre of a longstanding confusion as to whether an observed transparency is due to EIT or ATS, and as such, the distinction between the two is an active topic of research in the quantum optics community. Recently, it has been shown theoretically [4][5][6] as well as experimentally [7][8][9][10][11] that it is possible to objectively distinguish the regime where EIT dominates (EIT regime) from the one where ATS dominates (ATS regime).…”

Section: Introductionmentioning

confidence: 99%

Discerning quantum memories based on electromagnetically-induced-transparency and Autler-Townes-splitting protocols

et al. 2019

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Electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) are similar, but different quantum optical phenomena: EIT results from a Fano interference, whereas ATS is described by the AC-Stark effect. Likewise, despite their close resemblance, light-storage techniques based on the EIT memory protocol and the recently-proposed ATS memory protocol (E. Saglamyurek et al. Nature Photonics 12, 2018) are distinct: the EIT protocol relies on adiabatic elimination of absorption, whereas the ATS protocol is based on absorption. In this article, we elaborate on the distinction between EIT and ATS memory protocols through numerical analysis and experimental demonstrations in a cold rubidium ensemble. We find that their storage characteristics manifest opposite limits of the light-matter interaction due to their inherent adiabatic vs. non-adiabatic nature. Furthermore, we determine optimal memory conditions for each protocol and analyze ambiguous regimes in the case of broadband storage, where non-optimal memory implementations can possess characteristics of both EIT and ATS protocols. We anticipate that this investigation will lead to deeper understanding and improved technical development of quantum memories, while clarifying distinctions between the EIT and ATS protocols.

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“…Moreover, we note that interference between two dark resonances induced by the dynamic Stark splitting in a four-level system can further enhance the degree of freedom in manipulating atomic optical responses when we use a third electromagnetic field to perturb the transitions, hence the transfer of the quantum states [25]. Theories and experiments [25][26][27] have demonstrated that when the third electromagnetic field is applied, an absorption peak emerges in the original EIT window, which is an evidence of ac Stark effect. The splitting of EIT resonance may provide more channels to manipulate and control the quantum state preservation and transfer.…”

Section: Introductionmentioning

confidence: 86%

Manipulation of squeezed state in electromagnetically induced transparency system via dynamic Stark effect

Wang

et al. 2012

J. Opt. Soc. Am. B

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We calculate the delay time and noise spectrum of a squeezed state throughout an electromagnetically induced transparency medium with dynamic Stark splitting. It is shown that the noise spectrum splits into two parts with the same delay time, so that the delayed squeezing can survive well in two channels. Furthermore, we show that the two squeezing channels as well as the delay time can be manipulated via one-photon detuning and detection frequency such that the quantum state with high delay time and squeezing can be well preserved. This avoids the influence of large noise from laser near zero detection frequency.

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Resonances and excitation pathways in four-levelN-scheme atomic systems

Cited by 25 publications

References 20 publications

Dispersion in a four level N-scheme atomic system with co- and counter- propagating beams

Dispersion in a four level N-scheme atomic system with co- and counter- propagating beams

Discerning quantum memories based on electromagnetically-induced-transparency and Autler-Townes-splitting protocols

Manipulation of squeezed state in electromagnetically induced transparency system via dynamic Stark effect

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