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A silicon-based single-electron interferometer coupled to a fermionic sea

Chatterjee, A; Shevchenko, SN; Barraud, S; Otxoa, RM; Nori, F; Morton, JJL; Gonzalez-Zalba, MF; (2018) A silicon-based single-electron interferometer coupled to a fermionic sea. Physical Review B , 97 (4) , Article 045405. 10.1103/PhysRevB.97.045405. Green open access

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Abstract

We study Landau-Zener-Stückelberg-Majorana (LZSM) interferometry under the influence of projective readout using a charge qubit tunnel-coupled to a fermionic sea. This allows us to characterize the coherent charge-qubit dynamics in the strong-driving regime. The device is realized within a silicon complementary metal-oxide-semiconductor (CMOS) transistor. We first read out the charge state of the system in a continuous nondemolition manner by measuring the dispersive response of a high-frequency electrical resonator coupled to the quantum system via the gate. By performing multiple fast passages around the qubit avoided crossing, we observe a multipassage LZSM interferometry pattern. At larger driving amplitudes, a projective measurement to an evenparity charge state is realized, showing a strong enhancement of the dispersive readout signal. At even larger driving amplitudes, two projective measurements are realized within the coherent evolution resulting in the disappearance of the interference pattern. Our results demonstrate a way to increase the state readout signal of coherent quantum systems and replicate single-electron analogs of optical interferometry within a CMOS transistor.

Type: Article
Title: A silicon-based single-electron interferometer coupled to a fermionic sea
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.045405
Publisher version: http://dx.doi.org/10.1103/PhysRevB.97.045405
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, FIELD-EFFECT TRANSISTOR, SUPERCONDUCTING QUBIT, QUANTUM-DOT, SPIN-BLOCKADE, ATOM, GATE, INFORMATION, DEVICE, CHARGE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10041603
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