Optically driven atomic coherences in a Pr3+:Y2SiO5 crystal

Beil, Fabian; Klein, Jens; Halfmann, Thomas

doi:10.1016/j.photonics.2008.11.006

Cited by 3 publications

(7 citation statements)

References 21 publications

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“…That means, as can be seen in Figs. 3, the population, at the end of the interaction, on states |0 , |2 decreases from 1 2 → 1 3 , consequently this has the implication from Eq. ( 27) that the coherence ρ 02 would decrease as the noise increase and this is seen in Fig.…”

Section: Resultsmentioning

confidence: 84%

“…( 27). Fo the case of FSTIRAP the maximum transfer efficiency is 1 2 , on to states |0 and the target state |2 , which decreases to value of 1 3 as the noise from environment increases. That means, as can be seen in Figs.…”

Section: Resultsmentioning

confidence: 94%

“…To explore better what is happening plots of bare state populations and coherences for different values of Γ are investigated. It then follows that for the STIRAP pulse protocol the efficiency of the transfer decreases as the strength of the environment increase, until the strength is strong enough to make the process incoherent in which case the population transfer is 1 3 in each level. However, the condition needs closer look up for FSTIRAP protocol, because when there is no phonon coupling the system distributes the population equally between the two ground states |0 and |2 .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the total Hamiltonian can be expressed as the sum of these different parts [12]. Ĥ = Ĥsys + Ĥint + Ĥph + Ĥsys−ph (1) where Ĥsys , H int , Ĥph , Ĥsys−ph are, respectively, system Hamiltonian, interaction Hamiltonian between the system and the laser pulse, free Hamiltonian of the phonon, and interaction between system and phonon part of the Hamiltonian and are expressed as…”

Section: The System and Its Hamiltonianmentioning

confidence: 99%

“…Following the progress of techniques for complete population transfer, between two quantum states, via Stimulated Raman Adiabatic Passage (STIRAP) protocol, it is proposed and experimentally verified [1,13], that coherence between hyperfine levels can be created by fractional -Stimulated Raman adiabatic passage (FSTIRAP) which is derivative of STIRAP -an adiabatic process which provides complete coherent transfer in a Λ-type quantum system. For an isolated system which initially is prepared to be on the ground state |0 , one has the ability to transfer 50% of the population to state |2 using FSTIRAP, consequently creating coherence between states |0 ↔ |2 .…”

Section: Introductionmentioning

confidence: 99%

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Phonon as environmental disturbance in three level system

Hiluf¹

2018

Preprint

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This work investigates the effect of phonon coupling on the transfer of population and creation of coherence using variant of stimulated Raman adiabatic passage (STIRAP) known as fractional stimulated Raman adiabatic passage (FSTIRAP). The study is based on the Liouville equation, which is solved numerically in the adiabatic limit. Although the phonon is assumed to be coupled only to the intermediate state, it is coupled to the other two states by dipolar system-environment interaction, inducing phonon coupling to the other states which are not directly in contact with the phonon. At zero temperature the STIRAP pulse protocol's efficiency of the transfer decreases exponentially with the electron-phonon coupling, until the coupling strength is strong enough to make the process fully incoherent, in which case the population transfer is 1 3 in each level. For the FSTIRAP protocol we find that the transferred population to target state decreases, leaving some population on the intermediate state. Consequently, there is an increase in the magnitude of the coherences ρ01, ρ12, albeit small. Furthermore population transfer for non-zero temperature and effect of coupling strength is investigated, it is observed that while both parameters negatively influence the efficiency of transfer the former decrease the transfer exponentially, thereby equilibrating the system fast, while the latter seen to decrease the transfer monotonically, and hence equilibrates slowly.

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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: The System and Its Hamiltonianmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phonon as environmental disturbance in three level system

Hiluf¹

2018

Preprint

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Stimulated Raman adiabatic passage: Effects of system parameters on population transfer

2020

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Optical Flip-Flops and Shift Registers from populations and coherences in multi-level systems using stimulated Raman adiabatic passage

Hiluf,

Dubi

2017

Preprint

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In digital circuits, a Flip-Flop (FF) is a circuit element that has two stable states which can be used to store and remember state information. The state of the circuit can be changed by applying signals to the control input. FFs are the basic building blocks of sequential logic circuits, as logic gates AND,OR, NOT are the basic building block for combinational logic circuits, and are therefore necessary for any computations involving memory. Consequently, the design and implementation of FFs can be considered as a pre-requisite for memory machine design. Here we present the design of an optical FFs in an atomic multi-level system, based on the optical manipulation of populations and coherences using stimulated Raman adiabatic passage. We first demonstrate that both populations and coherences can be transferred over multistate systems. We then propose the design of toggle-FFs, Delay-FFs, and Serial-in Serial-Out (SISO) shift registers using such systems. For the design of the filp-flops we use a three level Λ-type system. In order to design SISO shift registers we concatenate two Λ-type systems and construct an "M"-type scheme, and similarly concatenating three Λ-type system we are able to obtain a seven level system. By concatenating we are able to use output of one three level Λ-type system serve as input of another three level Λ-type system. On top of using populations for design of logic gates, we uniquely exploit the coherences for logic machine, which provides an additional degree of freedom which can be used for the design of computing elements.Usage Secondary publications and information retrieval purposes.PACS numbers May be entered using the \pacs{#1} command.Structure You may use the description environment to structure your abstract; use the optional argument of the \item command to give the category of each item.

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Optically driven atomic coherences in a Pr3+:Y2SiO5 crystal

Cited by 3 publications

References 21 publications

Phonon as environmental disturbance in three level system

Phonon as environmental disturbance in three level system

Stimulated Raman adiabatic passage: Effects of system parameters on population transfer

Optical Flip-Flops and Shift Registers from populations and coherences in multi-level systems using stimulated Raman adiabatic passage

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