Effect of thermal noise on atom-field interaction: Glauber-Lachs versus mixing

Sivakumar, Srinivasan M.

doi:10.1140/epjd/e2012-30399-2

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…These results are exactly similar to the thermocoherent state for bosonic field [37][38][39] where one must emphasize that such similarity in the fermionic domain is essentially a major outcome of the crucial roles played by the Grassmann algebra and fermionic anticorrelation [10]. In a nutshell, fermionic thermocoherent state is a mixture of orthogonal states like in the bosonic case [40] and therefore for a multimode fermionic thermocoherent reservoir, the density operator can be expressed as…”

Section: Introductionsupporting

confidence: 61%

Nonzero current due to coherent dynamic electron transport through a dimer with no external bias

Karmakar,

Gangopadhyay

2024

Phys. Scr.

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We have proposed a mechanism of the interplay of injected coherence anddecoherence dynamics of the system in electron transport through an excitonic dimerwhen it is simultaneously connected to thermocoherent electron source and a thermalelectron sink. Due to such an interplay, the variation of current with the energygap between two excitonic states which is the internal bias of the system, is largelyaffected and it markedly bears the signature of the decoherence dynamics. We have alsoshown an extension in the modification of Landauer conductance formula for electrontransport through excitonic dimer. The current has the property of an asymmetry inspectral width which can be understood in terms of sum of two Lorentzian profiles.More remarkably we have shown that current due to electron transport through thedimer can also arise at zero external bias which is a purely quantum coherent effect ofthe source fermionic reservoir having zero thermal occupation number.

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Section: Introductionsupporting

confidence: 61%

Nonzero current due to coherent dynamic electron transport through a dimer with no external bias

Karmakar,

Gangopadhyay

2024

Phys. Scr.

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“…This state describes the pollution of the coherent state by the thermal noise and experimentally has been verified by Arecchi et al [34]. Temporal evolution of different proper ties (such as entropy squeezing, entanglement and population inversion) of a twolevel atom interacting with a quantunm field prepared initially in the Gluber-Lachs (GL) state by using the resonance JCM have been studied in [35][36][37]. Generally, the JCM and its extensions can be solved in the nonresonant case [38][39][40][41].…”

Section: Introductionmentioning

confidence: 88%

Atomic coherence in the nonresonant Jaynes–Cummings model with thermocoherent field

2016

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Using relative entropy of coherence, we study the atomic coherence (AC) in the nonresonant Jaynes-Cummings model, when the atom is initially prepared in an incoherent mixed state and the quantized field is in a thermocoherent (Glauber-Lachs) state. The influence of the increasing average number of thermal photons, average number of coherent photons and detuninig parameter on the AC are examined, separately in detail. We found that increasing the mean number of thermal (coherent) photons over a fixed mean number of the coherent (thermal) field has a destructive (constructive) effect on the AC. In addition, we see that the increment of detuning parameter leads to decrement of AC. Remarkably, we observe that in the particular case of thermal field, the AC cannot be created.

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“…Sivakumar compared the Glauber-Lachs super-position with the mixed thermal coherent state (MTCS) at the level of density operator [5]. The atomic inversion and the entanglement dynamics of both the states were compared, and it was reported that the MTCS is more sensitive to the thermal photon addition as opposed to the thermal photon addition in the G-L mixing.…”

mentioning

confidence: 99%

Atomic and entanglement dynamics in the mixed squeezed coherent state version of the Jaynes-Cummings interaction

Mandal¹,

Jethwani²,

Satyanarayana³

2021

Preprint

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The main objective of this work is to study the mixed state version of the Jaynes-Cummings model in the context of two-level atom interacting with a mixed field state of a squeezed vacuum and a coherent state. Here, the pure squeezed coherent state (PSCS) and the mixed squeezed coherent state (MSCS) have been used as the states of the radiation field. The photon-counting distribution (PCD), the atomic inversion and the entanglement dynamics of atom-field interaction for both the radiation fields are investigated and compared with each other. We observe that depending on the state of the field, squeezing has very different effects on coherent photons. Mild squeezing on the coherent photons localizes the PCD for PSCS; however, for MSCS there is no such localization observed -instead squeezing manifests for MSCS as oscillations in the PCD. The effects of squeezing on the atomic inversion and the entanglement dynamics for PSCS are very different as compared with the corresponding quantities associated with MSCS; in fact, they are contrasting. It is well known in the literature that for PSCS, increasing the squeezing increases the well-known ringing revivals in the atomic inversion, and also increases irregularity in the entanglement dynamics. However, increasing the squeezing in MSCS very significantly alters the collapse-revival pattern in the atomic inversion and the entanglement dynamics of the Jaynes-Cummings model. For MSCS, the effect of squeezing on the quadrature variables and Mandel's Q parameter are also presented.

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Effect of thermal noise on atom-field interaction: Glauber-Lachs versus mixing

Cited by 6 publications

References 23 publications

Nonzero current due to coherent dynamic electron transport through a dimer with no external bias

Nonzero current due to coherent dynamic electron transport through a dimer with no external bias

Atomic coherence in the nonresonant Jaynes–Cummings model with thermocoherent field

Atomic and entanglement dynamics in the mixed squeezed coherent state version of the Jaynes-Cummings interaction

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