STIRAP transport of Bose-Einstein condensate in triple-well trap

Nesterenko, V. O.; Novikov, Alexey; Cruz, Frederico Firmo de Souza; Lapolli, Emerson Luiz

doi:10.1134/s1054660x09040148

Cited by 40 publications

(70 citation statements)

References 47 publications

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“…The method dubbed CTAP (coherent transport adiabatic passage) operates by principles similar to that of STIRAP (stimulated Raman adiabatic passage, [4]) -an atom in a triple-well (threelevels) is transferred between the extreme wells (states) avoiding the middle well (state). The phenomenon has attracted attention in the context of single species in stand-alone quantum wells [5][6][7][8][9][10], but has been demonstrated only with photons in waveguides [11]. Setting aside its novelty value as an interesting quantum effect, our goal in this paper is to gauge its true applications potential by: (i) applying it to a lattice (Lattice-CTAP) with a view to scaling-up and parallel processing of atomic operations, (ii) considering two intermingled interacting species, with controllable overlap during spatial manipulation, and (iii) ensuring transfer algorithms optimized to work with or without a second species, to allow for lattice imperfections and for applications to entanglement.…”

Section: Introductionmentioning

confidence: 99%

Transparent nonlocal species-selective transport in an optical superlattice containing two interacting atom species

Gajdacz

Opatrný²,

Das³

2011

Phys. Rev. A

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In an optical superlattice of triple wells, containing two mutually interacting atom species in adjacent wells, we show that one species can be transported through the positions of the other species, yet avoiding significant overlap and direct interaction. The transfer protocol is optimized to be robust against missing atoms of either species in any lattice site, as well as against lattice fluctuations. The degree and the duration of the inter-species overlap during passage can be tuned, making possible controlled large-scale interaction-induced change of internal states.

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Section: Introductionmentioning

confidence: 99%

Transparent nonlocal species-selective transport in an optical superlattice containing two interacting atom species

Gajdacz

Opatrný²,

Das³

2011

Phys. Rev. A

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“…Following a different perspective, there have been several recent proposals to coherently manipulate single atoms [18][19][20] and BECs [13,21,22] in triple-well potentials by adiabatically following a particular energy eigenstate of the system, the so-called spatial dark state. This spatial dark state only involves the two ground states of the extreme traps in a close analogy to the well-known quantum optical stimulated Raman adiabatic passage (STIRAP) technique [23].…”

Section: Introductionmentioning

confidence: 99%

Adiabatic splitting, transport, and self-trapping of a Bose-Einstein condensate in a double-well potential

et al. 2010

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We show that the adiabatic dynamics of a Bose-Einstein condensate (BEC) in a double-well potential can be described in terms of a dark variable resulting from the combination of the population imbalance and the spatial atomic coherence between the two wells. By means of this dark variable, we extend, to the nonlinear matter-wave case, the recent proposal by Vitanov and Shore [Phys. Rev. A 73, 053402 (2006)] on adiabatic passage techniques to coherently control the population of two internal levels of an atom or molecule. We investigate the conditions to adiabatically split or transport a BEC as well as to prepare an adiabatic self-trapping state by the optimal delayed temporal variation of the tunneling rate via either the energy bias between the two wells or the BEC nonlinearity. The emergence of nonlinear eigenstates and unstable stationary solutions of the system as well as their role in the breaking down of the adiabatic dynamics is investigated in detail.

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“…Due to the promise of scalability and long decoherence times, the applications of adiabatic passage for coherent QST have been widely investigated in solid-state systems [3][4][5][6][7][8][9][10][11][12][13][14][15]. Such methods are relatively insensitive to gate errors and other external noises and do not require an accurate control of the system parameters, thus they can realize high-fidelity QST.…”

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confidence: 99%

Adiabatic quantum state transfer in a nonuniform triple-quantum-dot system

Chen

Fan

2011

Phys. Rev. A

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We introduce an adiabatic quantum state transfer scheme in a nonuniform coupled triple-quantum-dot system. By adiabatically varying the external gate voltage applied on the system, the electron can be transferred between two spatially separated dots. We numerically study the effect of the system parameters on transfer fidelity and find a perfect matching between them. We also find that there is a relatively large tolerance range of difference between two coupling constants to permit high-fidelity quantum state transfer.The coherent control of transitions between individual discrete quantum states is central to the study of quantum state transfer (QST) [1,2]. Due to the promise of scalability and long decoherence times, the applications of adiabatic passage for coherent QST have been widely investigated in solid-state systems [3][4][5][6][7][8][9][10][11][12][13][14][15]. Such methods are relatively insensitive to gate errors and other external noises and do not require an accurate control of the system parameters, thus they can realize high-fidelity QST. Zhang et al. [5] have described a scheme for using an all-electric, adiabatic population transfer between two spatially separated dots in a triple-quantum-dot (TQD) system by adiabatically engineering the external gate voltage. Recently, a robust method, termed coherent tunneling by adiabatic passage (CTAP), has also been introduced for the spatial transport of physical particles both in optical microtraps [6] and quantum dots [7] which is a spatial analog of the well-known stimulated Raman adiabatic passage (STIRAP) technique [16] from quantum optics. In such a technique, the basic idea is to use the existence of a spatial dark state which is a coherent superposition state of two "distant" spatial trapping sites. Via adiabatic manipulation of the dark-state wave function, it is possible to transport electrons from one trapping site to another.In this paper we consider a different adiabatic protocol to achieve population transfer between two spatially separated dots. We introduce a nonuniform coupled TQD array which can be manipulated by the external gate voltage applied on the two external dots (sender and receiver). Through maintaining the system in the ground state we show that the electron initially in the left dot can be transferred to the right dot occupation with high fidelity. Furthermore, we study in detail the dynamic competition between the adiabatic QST and the decoherence. There are two time scales τ A and τ D depicting such competition, where τ A represents the adiabatic time limited by the adiabatic conditions and τ D represents the decoherence time.We first introduce the isolated (no coupling to the leads) TQD array |L,σ , |M,σ , and |R,σ (σ =↑ , ↓), where |κ,σ (κ = L,M,R) corresponds to an electron in the dot κ with spin σ . The scheme is schematically shown in Fig. 1(a). Specifically, we consider the interactions between nearestneighbor quantum dots to be time independent and slightly * ashitakatosan@gmail.com † x1y5@hotmail.com different. We te...

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STIRAP transport of Bose-Einstein condensate in triple-well trap

Cited by 40 publications

References 47 publications

Transparent nonlocal species-selective transport in an optical superlattice containing two interacting atom species

Transparent nonlocal species-selective transport in an optical superlattice containing two interacting atom species

Adiabatic splitting, transport, and self-trapping of a Bose-Einstein condensate in a double-well potential

Adiabatic quantum state transfer in a nonuniform triple-quantum-dot system

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