All-electrical quantum computation with mobile spin qubits

Popescu, A.; Ionicioiu, Radu

doi:10.1103/physrevb.69.245422

Cited by 35 publications

(32 citation statements)

References 104 publications

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“…The second class is based on flying qubits, i.e., mobile electrons which move through the circuit, passing via quantum gates implemented in predefined areas by static electric and magnetic fields. 7 In this paper we consider the second class of spin qubits and focus on spin filters: devices which polarize the spins of electrons going through them along tunable directions, or equivalently, write quantum information on these mobile qubits. Specifically, we concentrate on time-reversal symmetric devices, operating in the absence of external magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Spin filtering in all-electrical three-terminal interferometers

et al. 2017

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Unlike the two-terminal device, in which the time-reversal invariant spin-orbit interaction alone cannot polarize the spins, such a polarization can be generated when electrons from one source reservoir flow into two (or more) separate drain reservoirs. We present analytical solutions for two examples. First, we demonstrate that the electrons transmitted through a "diamond" interferometer into two drains can be simultaneously fully spin-polarized along different tunable directions, even when the two arms of the interferometer are not identical. Second, we show that a single helical molecule attached to more than one drain can induce a significant spin polarization in electrons passing through it. The average polarization remains non-zero even when the electrons outgoing into separate leads are eventually mixed incoherently into one absorbing reservoir. This may explain recent experiments on spin selectivity of certain helical-chiral molecules.

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Section: Introductionmentioning

confidence: 99%

Spin filtering in all-electrical three-terminal interferometers

et al. 2017

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“…Two alternative possibilities have been considered in literature, namely the charge localization of electrons transmitted through a couple of QWRs [8][9][10][11] and the spin orientation of electrons, moving along a single QWR [12,13]. In both cases the theoretical feasibility of a universal set of quantum gates has been demonstrated.…”

Section: Qubits As Electron States In Quantum Wiresmentioning

confidence: 98%

Perspectives on solid-state flying qubits

Bertoni¹

2006

J Comput Electron

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“…Such processing uses the ideas of moving the qubits to various sites where manipulations are performed [20,21]. More recently, this idea of "flying" qubits has been discussed in connection with the use of spin for the quantum state [22]. In this application, the spin state accompanies an electron (or hole) moving through the quantum wire.…”

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confidence: 98%

Quo Vadis Nanoelectronics?

Ferry

2008

Phys. Status Solidi (c)

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Semiconductor devices continue to be downscaled on a regular basis as technology provides the ability to make smaller dimensions via improved lithography, a process which is known as Moore's Law. However, the driving force for the continued increase in number of devices on a chip is not this reduction in size, but the ability to put more functions on a chip with the same cost per unit area of Si. Nevertheless, it is not clear that our technology for Si devices can continue to work much longer. Here, I will discuss the driving forces, including energy dissipation, speed, area, and technological factors for the projected end‐of‐the roadmap technology. Yet, there continues to be a search for new device technologies to supplement, or replace, Si CMOS. Quantum wires have been sug‐gested in many places as a possible new technology that can provide many opportunities for enhancing chip architecture. But, the constraints on any new technology can be viewed in terms of Si cost, and the manner in which new approaches to devices can be pursued will be dis‐cussed. Some possible technologies are FinFETs, vertical quantum wires, carbon nanotubes, III‐Vs, and similar ap‐proaches. Device downsizing is only one of three driving forces that lead to Moore's Law, with increasing chip size and circuit cleverness playing an equal part. This suggests that many novel devices should not be viewed as competition to CMOS, but in the light of how they may modify the circuit architecture. Indeed, circuit clev‐erness has been as important in managing breakthroughs in the past as new processing technology. Some new op‐portunities, that arise from the nature of nanowire fabri‐cation, in these novel devices may lead to breakthroughs in the area of circuit cleverness. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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All-electrical quantum computation with mobile spin qubits

Cited by 35 publications

References 104 publications

Spin filtering in all-electrical three-terminal interferometers

Spin filtering in all-electrical three-terminal interferometers

Perspectives on solid-state flying qubits

Quo Vadis Nanoelectronics?

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