Effective dynamics of cold atoms flowing in two ring-shaped optical potentials with tunable tunneling

Aghamalyan, Davit; Amico, Luigi; Kwek, Leong Chuan

doi:10.1103/physreva.88.063627

Cited by 49 publications

(55 citation statements)

References 43 publications

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“…Also interesting is the possibility of using the PDR to coherently injecting, extracting, and velocity filtering of particles, ultra-cold atoms and BECs as reported in [142,144] by tuning the polarization of the input beam and opening/closing the ring potential. Finally, we would also like to note that by switching to red-detuned light, the inner and outer bright rings around the PDR generate an intrinsically concentric system of a double-ring potential which can be used for the generation of coherent double wave packets for the investigation of wave packet tunneling and coupled persistent currents of ultra cold atoms [221,222].…”

Section: Discussionmentioning

confidence: 99%

Conical refraction: fundamentals and applications

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Loiko

Kalkandjiev

et al. 2016

Laser & Photonics Reviews

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A mis padres, hermanos, sobrinos y a Raquel AcknowledgmentsTot té un principi i un final i aquest serà el punt final a una etapa de la meva vida la qual estic segur que d'aquí uns anys, quan miri enrere, veuré que ha estat probablement la que ha tingut una major rellevància tant a nivell personal com científic. Quan vaig acabar la carrera no tenia gaire clar quin camí seguir però vaig tenir la sort de parlar amb qui ha estat el meu director de tesi, el Jordi, qui em va guiar i va posar tota la seva confiança en mi des del primer moment. Em va oferir un tema original i es va aventurar a dirigir una tesi amb una forta vessant experimental, tot un atreviment venint d'un teòric! Quan vaig començar el Màster, si m'haguessin dit on he arribat 5 anys després mai m'ho hauria cregut i, Jordi, tu tens gran part de culpa de tot això. Moltes gràcies per haver confiat en mi des del primer dia, per haver-te mostrat sempre tan orgullós de tot el que he fet, per haver estat sempre disponible i per ajudar-me i animar-me quan he passat moments durs durant aquest anys. M'has ensenyat a ser un bon científic, a moure'm dins aquest món, a creure em mi i a ser una millor persona. Mai t'estaré prou agraït per tot això i per haver sigut tan proper amb els teus cotilleos, converses de futbol, política, noies, etc. dinant al bar. Has estat com un pare per a mi (bueno, un germà gran, que tampoc ets tan vell per a ser Mompare :P). Si el Jordi ha estat el meu pare en la ciència, el Yury ha estat el meu gurú científic. Mai he trobat una persona tan pacient, que sàpiga tant de qualsevol tema i amb tanta dedicació com tu. M'has ensenyat a ser riguròs, a tenir un mètode, la importància de estar al dia de tot el que es fa en el cap d'estudi, a programar, i un llarg etcètera. En resum, m'has ajudat a donar-me forma a mi mateix com a científic i a tenir perseverança en el que faig. Tot això sense oblidar que per a mi ets un gran amic! Seguidament, també he donar les gràcies al Todor, una de les persones més enèrgiques que conec i amb més passió per la ciència. Tu vas iniciar tot el tema de la refracció cònica al nostre grup i has demostrat que ets realment qui més coneix de cristalls i del fenomen en si. Si no hagués estat per tu, no podríem haver començat res d'això i no podríem haver explotat el fenomen ni una quarta part del que hem fet. Ets un exemple per tenir sempre un somriure a la cara i per aquesta iii iv força que et fa tirar endavant tots els teus projectes. També vull donar les gràcies a altres companys del Grup d'Òptica, començant per la Verònica, que va passar de ser una "professora de la carrera" a ser el meu ideal de constància i l'esforç. Ets un exemple professional a més a més d'una persona molt més propera i alegra del que pot semblar a primera vista. A Ramón también le tengo que agradecer su ayuda y su disponibilidad a lo largo de estos años, su paciencia cuando ha tenido que soportar mis imitaciones y su alegría y naturalidad en todo momento. Amb el Francesc també he compartit molts bons moments, sobretot a les diverses activit...

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Section: Discussionmentioning

confidence: 99%

Conical refraction: fundamentals and applications

Turpin

Loiko

Kalkandjiev

et al. 2016

Laser & Photonics Reviews

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“…Ultracold atoms, as superfluids, can also exhibit phase slips, by winding the phase through solitonic states [21][22][23][24][25], and they are able to generate quantum superpositions of macroscopic flows [26]. The literature includes several proposals to engineer superpositions of flow states in 1D quantum gases in continuous rings [27,28] and discrete rings [31][32][33][34][35] (toroidal condensates in the presence of a lattice potential in the tight-binding regime [29,30]).…”

Section: Introductionmentioning

confidence: 99%

Coherent quantum phase slip in two-component bosonic atomtronic circuits

et al. 2015

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“…The the interring tunneling, however can be made negligible with different approaches (for example suitably focusing the laser beams). See also[28].…”

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confidence: 99%

Coherent superposition of current flows in an atomtronic quantum interference device

et al. 2015

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We consider a correlated Bose gas tightly confined into a ring shaped lattice, in the presence of an artificial gauge potential inducing a persistent current through it. A weak link painted on the ring acts as a source of coherent back-scattering for the propagating gas, interfering with the forward scattered current. This system defines an atomic counterpart of the rf-SQUID: the atomtronics quantum interference device. The goal of the present study is to corroborate the emergence of an effective twolevel system in such a setup and to assess its quality, in terms of its inner resolution and its separation from the rest of the many-body spectrum, across the different physical regimes. In order to achieve this aim, we examine the dependence of the qubit energy gap on the bosonic density, the interaction strength, and the barrier depth, and we show how the superposition between current states appears in the momentum distribution (time-of-flight) images. A mesoscopic ring lattice with intermediate-tostrong interactions and weak barrier depth is found to be a favorable candidate for setting up, manipulating and probing a qubit in the next generation of atomic experiments. through a small spatial region, where an effective potential constriction (giving rise to the aforementioned weak link) is created via a very focused blue-detuned laser or via a painting potential [20][21][22][23].On the theoretical side, it has been demonstrated that the two currents flowing in the AQUID can, indeed, define an effective two-level system, that is, the cold-atom analog of flux qubits [24,25]. The potential constriction breaks the Galilean invariance and splits the qubit levels that otherwise would be perfectly degenerate at half-flux quantum. In this context, it is of vital importance for the qubit dynamics that a good energy resolution of the two levels could be achieved in realistic physical situations (while keeping the qubit well separated from the rest of the many-body spectrum).In this paper we focus on ring-shaped confinements with a lattice modulation and a potential constriction. This set-up, that can be realized following different routes (see, e.g., [25]), presents several advantages for the design of an AQUID. First of all, assuming that the bosons occupy only the lowest Bloch band 8 , the ring lattice helps in controlling the current. For instance, because of the one-dimensional dynamics, the vortex formation rate along the flow is negligible. Secondly, it helps localizing the barrier effect to a point-like scale with respect to lattice spacing, which should in turn yield a favorable scaling of the qubit gap with the bosonic density [27]. Moreover, it provides an easy route to realize interacting ring-ring architectures [14,25] This issue has been considered so far only in some limiting cases, e.g. for particular types of superposition states or in the infinitely strong interacting regime [27,29]. We perform a systematic study on the quality of the qubit in the cold-atom ring lattice: in particular, we characterize the en...

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Effective dynamics of cold atoms flowing in two ring-shaped optical potentials with tunable tunneling

Cited by 49 publications

References 43 publications

Conical refraction: fundamentals and applications

Conical refraction: fundamentals and applications

Coherent quantum phase slip in two-component bosonic atomtronic circuits

Coherent superposition of current flows in an atomtronic quantum interference device

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