Abstract
Transistors are key elements for enabling computational hardware in both classical and quantum domains. Here, we propose a voltage-gated spin transistor using itinerant electrons in the Hubbard model which acts at the level of single electron spins. Going beyond classical spintronics, it enables the controlling of the flow of quantum information between distant spin qubits. The transistor has two modes of operation, open and closed, which are realized by two different charge configurations in the gate of the transistor. In the closed mode, the spin information between source and drain is blocked while in the open mode we have free spin information exchange. The switching between the modes takes place within a fraction of the operation time which allows for several subsequent operations within the coherence time of the transistor. The system shows good resilience against several imperfections and opens up a practical application for quantum dot arrays.
Highlights
Transistors are the building blocks of our electronic technologies
We propose a voltage-gated spin transistor using itinerant electrons in the Hubbard model which acts at the level of single electron spins
The switching between the modes takes place within a fraction of the operation time which allows for several subsequent operations within the coherence time of the transistor
Summary
Transistors are the building blocks of our electronic technologies. They are used as fast electric current switches in every digital electronic device [1,2]. Quantum spin transistors (QSTs) have been proposed for Heisenberg spin chains [34,35], superconducting devices [36,37,38,39], bosonic quantum oscillators [40], and symmetry protected many-body systems with adiabatic passage [41,42,43] In these proposals, the switching of the information flow in QSTs is controlled by either a magnetic [34,36,40,41,42,44] or a periodic driving [35] field. The robustness of the proposed QST against different types of noise is investigated and the obtained results based on realistic parameters demonstrate the capability of the QST to operate with high fidelity in a realistic noisy setting It provides a new utilization for quantum dot arrays. Thanks to the absence of magnetic field, this condition is satisfied and the valley degree of freedom is conserved for the ground state of the system
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