Efficient Clocked Electron Transfer on Superfluid Helium

Bradbury, F. R.; Takita, Maika; Gurrieri, Thomas M.; Wilkel, K. J.; Eng, Kevin; Carroll, Malcolm S.; Lyon, S. A.

doi:10.1103/physrevlett.107.266803

Cited by 42 publications

(41 citation statements)

References 26 publications

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“…The fourth and fifth gates, T4 and T5, have the same dimensions as the first two, which forms a symmetric turnstile region. Electrons are detected in the sensing region which branches out from the channel, creating a larger area for electrons to be detected through a capacitive coupling to a wide sense gate [2]. A small ac-voltage (V ac ) is applied to the twiddle gate to push electrons on and off the sense, while a narrow gate between these two gates shields the direct capacitive coupling between them.…”

Section: Device Structurementioning

confidence: 99%

“…Electrons are bound above the surface of liquid helium by their weak image potential as well as potentials from underlying electrostatic gates [1,4,12,14]. These underlying gates control the position of electrons on helium and can move them across the sample into various regions [2,10]. The electrons reside in vacuum, about 11nm above the surface, forming a very clean classical two dimensional electron system.…”

Section: Introductionmentioning

confidence: 99%

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Isolating electrons on superfluid helium

Takita

Lyon²

2014

J. Phys.: Conf. Ser.

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Electrons floating on the surface of superfluid helium have been suggested as promising mobile spin quantum bits (qubits). Transferring electrons extremely efficiently in a narrow channel structure with underlying gates has been demonstrated, showing no transfer error while clocking 10 9 pixels in a 3-phase charge coupled device (CCD). While on average, one electron per channel was clocked, it is desirable to reliably obtain a single electron per channel. We have designed an electron turnstile consisting of a narrow (0.8µm) channel and narrow underlying gates (0.5µm) operating across seventy-eight parallel channels. Initially, we find that more than one electron can be held above the small gates. Underlying gates in the turnstile region allow us to repeatedly split these electron packets. Results show a plateau in the electron signal as a function of the applied gate voltages, indicating quantization of the number of electrons per pixel, simultaneously across the seventy-eight parallel channels.

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Section: Device Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isolating electrons on superfluid helium

Takita

Lyon²

2014

J. Phys.: Conf. Ser.

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“…In addition, the Coulomb interaction between the electrons is not screened by the helium, which has a permittivity close to that of vacuum. This makes surface electrons an ideal model system for the study of strongly correlated electron behaviours in 2D [15] and, in recent experiments using microchannel devices, transport at the nanoscale in the limit of strong electron-electron interaction [16,17].…”

Section: Introductionmentioning

confidence: 99%

Bistable transport properties of a quasi-one-dimensional Wigner solid on liquid helium under continuous driving

Rees

Yeh

Lee³

et al. 2017

Phys. Rev. B

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We investigate low-frequency fluctuations in the transport characteristics of a quasi-1D Wigner solid (WS) moving along a liquid helium substrate in response to a sinusoidal driving voltage. The fluctuations occur between distinct transport modes in which the decoupling of the WS from ripplonic polarons (or 'dimple lattice', DL) formed on the helium surface does, or does not, occur during each ac cycle. We demonstrate that a Gaussian-like distribution in the decoupling threshold force gives rise to this bistability, as the low-frequency switching occurs when the probability of decoupling during each ac cycle is small but finite. We attribute the distribution in the decoupling threshold force to the range of structural configurations allowed for the quasi-1D electron lattice, which influences the strength of the WS-DL coupling. Hence, the switching rate between the ac transport modes is extremely sensitive to the microscopic properties of the electron solid.

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“…Refrigeration of arrays of heat-dissipating nanodevices by means of superfluid helium is a particular problem of cryogenics [1] both for cooling nanoelectronic and nanomechanical devices down to millikelvin and sub-millikelvin temperatures, as recently performed in laboratories and in aerospatial cryogenics, and for representing a potential future interest in computer refrigeration, as for instance in quantum computers which require a high extent of quantum coherence of the global wave function for qubits [2][3][4][5][6][7][8][9], achieved at very low temperature.…”

Section: Introductionmentioning

confidence: 99%

Refrigeration of an Array of Cylindrical Nanosystems by Flowing Superfluid Helium

2016

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We consider the refrigeration of an array of heat-dissipating cylindrical nanosystems as a simplified model of computer refrigeration. We explore the use of He II as cooling fluid, taking into account forced convection and heat conduction. The main conceptual and practical difficulties arise in the calculation of the effective thermal conductivity. Since He II does not follow Fourier's law, the effective geometry-dependent conductivity must be extracted from a more general equation for heat transfer. Furthermore, we impose the restrictions that the maximum temperature along the array should be less than T λ transition temperature and that quantum turbulence is avoided, in order not to have too high heat resistance.

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Efficient Clocked Electron Transfer on Superfluid Helium

Cited by 42 publications

References 26 publications

Isolating electrons on superfluid helium

Isolating electrons on superfluid helium

Bistable transport properties of a quasi-one-dimensional Wigner solid on liquid helium under continuous driving

Refrigeration of an Array of Cylindrical Nanosystems by Flowing Superfluid Helium

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