Mesoscopic phase behavior in a quantum dot around crossover between single-level and multilevel transport regimes

Takada, Shintaro; Yamamoto, Mahito; Bäuerle, Christopher; Ludwig, Arne; Wieck, A. D.; Tarucha, Seigo

doi:10.1103/physrevb.95.241301

Cited by 5 publications

(5 citation statements)

References 29 publications

(60 reference statements)

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“…Inspired by these experiments, a refined beam-splitter geometry has been developed to demonstrate the basic principles of flying charge qubit manipulations in a Mach-Zehnder interferometry setup with a continuous stream of ballistic electrons 22,23 . This progress moreover opened up the way for precise transmission-phase measurements of QD states [24][25][26] and detailed studies on quantum phenomena such as the Kondo effect 27,28 . Considering the coherence times in stationary charge [29][30][31][32] or spin qubits [33][34][35] , it should be possible to use a surfacegate defined beam-splitter component to implement quantum logic gates in GaAs-based heterostructures for solitary flying electron qubits.…”

Section: Introductionmentioning

confidence: 99%

Sound-driven single-electron transfer in a circuit of coupled quantum rails

Takada¹,

Edlbauer²,

Lepage³

et al. 2019

Nat Commun

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Surface acoustic waves (SAWs) strongly modulate the shallow electric potential in piezoelectric materials. In semiconductor heterostructures such as GaAs/AlGaAs, SAWs can thus be employed to transfer individual electrons between distant quantum dots. This transfer mechanism makes SAW technologies a promising candidate to convey quantum information through a circuit of quantum logic gates. Here we present two essential building blocks of such a SAW-driven quantum circuit. First, we implement a directional coupler allowing to partition a flying electron arbitrarily into two paths of transportation. Second, we demonstrate a triggered single-electron source enabling synchronisation of the SAW-driven sending process. Exceeding a single-shot transfer efficiency of 99%, we show that a SAW-driven integrated circuit is feasible with single electrons on a large scale. Our results pave the way to perform quantum logic operations with flying electron qubits.

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Section: Introductionmentioning

confidence: 99%

Sound-driven single-electron transfer in a circuit of coupled quantum rails

Takada¹,

Edlbauer²,

Lepage³

et al. 2019

Nat Commun

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“…On the one hand, our work thus contributes to the important problem of wave-function correlations close to the boundary of a billiard [53]. On the other hand, it is experimentally relevant given the departures from a universal phase-locking of the conductance recently measured [30,31] and in view of current experiments measuring the transmission phase in microwave cavities [58].…”

Section: Discussionmentioning

confidence: 84%

“…While the early experiments [23,24] showed sequences of perfectly universal phase evolution with phase-lapses in every conductance valley (except for extremely low electron fillings in the dot [25]), recent measurements using a new way to reliably extract the transmission phase from the conductance of an Aharonov-Bohm interferometer [29] detected several conductance minima without phase-lapses [30,31]. Though it has not been possible to achieve a complete statistics in these last experiments, the findings are consistent with the predicted departure from the universal behavior of a perfect phase-locking of conductance peaks [26,28].…”

Section: Introductionmentioning

confidence: 99%

Correlation between peak-height modulation and phase lapses in transport through quantum dots

et al. 2017

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We show that two intriguing features of mesoscopic transport, namely the modulation of Coulomb blockade peak-heights and the transmission phase-lapses occurring between subsequent peaks, are closely related. Our analytic arguments are corroborated by numerical simulations for chaotic ballistic quantum dots. The correlations between the two properties are experimentally testable. The statistical distribution of the partial-width amplitude, at the heart of the previous relationship, is determined, and its characteristic parameters are estimated from simple models.

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“…We focus on the airbridge technique, which is successful in various mesoscopic electronic devices. [17][18][19] Here, we demonstrate a QAD formed with an airbridge gate on an AlGaAs/GaAs heterostructure. A small pillarshaped surface gate with a sub-micron diameter is biased via the airbridge structure to define bound states around the potential hill.…”

mentioning

confidence: 92%

Quantum anti-dot formed with an airbridge gate in the quantum Hall regime

Eguchi¹,

Kamata²,

Lin³

et al. 2019

Appl. Phys. Express

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We demonstrate a quantum antidot (QAD) formed with an airbridge gate on an AlGaAs/GaAs heterostructure, where a sub-micron pillar-shaped surface gate is biased via the bridge. We study transport through the QAD in the two regimes; one with a fully depleted region and the other with a partially depleted region at the center of the QAD. While standard Coulomb blockade (CB) oscillations with discrete levels are observed in the fully depleted region, short-period CB oscillations and more complicated patterns with multiple QADs are seen in the partially depleted region. The device is promising for investigating the few-particle regime.

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Mesoscopic phase behavior in a quantum dot around crossover between single-level and multilevel transport regimes

Abstract: International audienc

Cited by 5 publications

References 29 publications

Sound-driven single-electron transfer in a circuit of coupled quantum rails

Sound-driven single-electron transfer in a circuit of coupled quantum rails

Correlation between peak-height modulation and phase lapses in transport through quantum dots

Quantum anti-dot formed with an airbridge gate in the quantum Hall regime

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