Magnetic conveyor belt transport of ultracold atoms to a superconducting atomchip

Minniberger, Stefan; Diorico, Fritz; Haslinger, Stefan; Hufnagel, Christoph; Novotny, C.; Lippok, Nils; Majer, Johannes; Koller, Ch.; Schneider, Stephan; Schmiedmayer, Jörg

doi:10.1007/s00340-014-5790-5

Cited by 30 publications

(27 citation statements)

References 35 publications

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“…Moreover, our resonator is fully fiber-integrated and alignment-free. It is therefore suitable for a large variety of emitters [4,[44][45][46][47][48][49] and, thanks to its implementation in a cryogenic environment without any loss in transmission, might also be used for the implementation of quantum hybrid systems [50,51].…”

Section: Resultsmentioning

confidence: 99%

Nanofiber-based high-Q microresonator for cryogenic applications

Hütner¹,

Hoinkes²,

Becker³

et al. 2020

Opt. Express

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We demonstrate a cryo-compatible, fully fiber-integrated, alignment-free optical microresonator. The compatibility with low temperatures expands its possible applications to the wide field of solid-state quantum optics, where a cryogenic environment is often a requirement. At a temperature of 4.6 K we obtain a quality factor of (9.9 ± 0.7) × 10 6 . In conjunction with the small mode volume provided by the nanofiber, this cavity can be either used in the coherent dynamics or the fast cavity regime, where it can provide a Purcell factor of up to 15. Our resonator is therefore suitable for significantly enhancing the coupling between light and a large variety of different quantum emitters and due to its proven performance over a wide temperature range, also lends itself for the implementation of quantum hybrid systems. IntroductionAchieving efficient coupling between quantum emitters and light is an important goal of research in quantum communication and computation, sensor applications and fundamental studies. Such an efficient interaction can for example be realized by means of an optical cavity or by reducing the mode area of the light field to the size of the emitter's interaction cross-section. Optical nanofibers offer such a strong transverse confinement of the light field.This makes them a versatile tool for interfacing different types of emitters such as atoms [1-3], single molecules [4], quantum dots [5][6][7] and color centers in diamond [8,9]. For many proof-of-principle experiments, cold atoms were the emitters of choice as they represent a well-controlled and isolated system. However, the experimental overhead for a cold-atom set-up is significant and solid-state emitters are much more suitable for practical and scalable platforms for quantum networks or nanosensors [10,11].Yet, the optical transitions of solid state emitters also couple to the phononic degrees of freedom of the system, leading to dephasing and inelastic scattering. In order to avoid this problem, the phonons of the system have to be frozen out and the branching ratio of emission into the coherent zero-phonon line has to be maximized. Further, cryogenic temperatures may be required to be able to spectrally address individual solid state emitters in the case, where many are present in the same host system [4]. This calls for a cryo-compatible optical microresonator with high quality factor, Q, that selectively accelerates the desired optical transition via the Purcell effect [12][13][14][15].Here, we show that a fully fiber-based optical microresonator that consists of a tapered optical fiber with two integrated fiber Bragg gratings (FBGs) [16,17], as demonstrated in [18], can be employed at cryogenic temperatures. In particular, we confirm that a high Q factor prevails after contact gas-cooling from room temperature to liquid helium temperature. Consequently, the resonator is still compatible with reaching the strong coupling regime. Furthermore, for usage at cryogenic temperatures, the alignment-free character of our resonator represen...

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Section: Resultsmentioning

confidence: 99%

Nanofiber-based high-Q microresonator for cryogenic applications

Hütner¹,

Hoinkes²,

Becker³

et al. 2020

Opt. Express

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“…To enable a protocol that manages the correlations of the system, further studies are needed to understand the mechanism behind the k 3 c -pattern in the momentum distribution as well as the behavior of the emergent effects as a function of the offset δ and the couplings   U U , . Future studies may also include interparticle interactions between atoms in distinct components, multi-modal [78,79] and microwave [19,20] cavities, or consider more than one spatial dimension. Furthermore, the non-equilibrium dynamics of selforganization [31] or the investigation of fermionic systems [80] or systems with cavity-mediated long-range [10] and/or dipole-dipole [81,82] interactions are of exceptional interest.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, ultracold atoms are readily accessible and can have decoherence times of several seconds [15,18]; thus ultracold atoms and, in particular, their hyperfine states (usually the 'clock states') have bright prospects for quantum information storage. Attempts to collectively couple the microwave hyperfine ground state of an ultracold atomic ensemble in a cavity QED setting with a superconducting resonator are already being pursued by numerous groups across the world despite the substantial technical challenges [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Many-body physics in two-component Bose–Einstein condensates in a cavity: fragmented superradiance and polarization

et al. 2018

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We consider laser-pumped one-dimensional two-component bosons in a parabolic trap embedded in a high-finesse optical cavity. Above a threshold pump power, the photons that populate the cavity modify the effective atom trap and mediate a coupling between the two components of the Bose-Einstein condensate. We calculate the ground state of the laser-pumped system and find different stages of selforganization depending on the power of the laser. The modified potential and the laser-mediated coupling between the atomic components give rise to rich many-body physics: an increase of the pump power triggers a self-organization of the atoms while an even larger pump power causes correlations between the self-organized atoms-the BEC becomes fragmented and the reduced density matrix acquires multiple macroscopic eigenvalues. In this fragmented superradiant state, the atoms can no longer be described as two-level systems and the mapping of the system to the Dicke model breaks down.

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“…The final seqeunce is the loading into the superconducting atomchip where a bias field and the transport current for the niobium wire is ramped up to a desired value that creates the trap. Details of the magnetic transport and loading schemes are discussed in detail in [37]. The niobium film experience a maximum field of almost 100 mT.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

Current-induced magnetization hysteresis defines atom trapping in a superconducting atomchip

et al. 2018

Self Cite

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The physics of superconducting films, and especially the role of remanent magnetization has a defining influence on the magnetic fields used to hold and manipulate atoms on superconducting atomchips. We magnetically trap ultracold 87 Rb atoms on a 200 µm wide and 500 nm thick cryogenically cooled niobium Z-wire structure. By measuring the distance of the atomcloud to the trapping wire for different transport currents and bias fields, we probe the trapping characteristics of the niobium superconducting structure. At distances closer than the trapping wire width, we observe a different behaviour than that of normal conducting wire traps. Furthermore, we measure a stable magnetic trap at zero transport current. These observations point to the presence of a remanent magnetization in our niobium film which is induced by a transport current. This current-induced magnetization defines the trap close to the chip surface. Our measurements agree very well with an analytic prediction based on the critical state model (CSM). Our results provide a new tool to control atom trapping on superconducting atomchips by designing the current distribution through its current history.

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Magnetic conveyor belt transport of ultracold atoms to a superconducting atomchip

Cited by 30 publications

References 35 publications

Nanofiber-based high-Q microresonator for cryogenic applications

Nanofiber-based high-Q microresonator for cryogenic applications

Many-body physics in two-component Bose–Einstein condensates in a cavity: fragmented superradiance and polarization

Current-induced magnetization hysteresis defines atom trapping in a superconducting atomchip

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