skip to main content

SciTech ConnectSciTech Connect

Title: Multiplexed charge-locking device for large arrays of quantum devices

We present a method of forming and controlling large arrays of gate-defined quantum devices. The method uses an on-chip, multiplexed charge-locking system and helps to overcome the restraints imposed by the number of wires available in cryostat measurement systems. The device architecture that we describe here utilises a multiplexer-type scheme to lock charge onto gate electrodes. The design allows access to and control of gates whose total number exceeds that of the available electrical contacts and enables the formation, modulation and measurement of large arrays of quantum devices. We fabricate such devices on n-type GaAs/AlGaAs substrates and investigate the stability of the charge locked on to the gates. Proof-of-concept is shown by measurement of the Coulomb blockade peaks of a single quantum dot formed by a floating gate in the device. The floating gate is seen to drift by approximately one Coulomb oscillation per hour.
Authors:
; ; ; ; ; ;  [1] ; ;  [1] ;  [2] ;  [3]
  1. Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE (United Kingdom)
  2. (United Kingdom)
  3. Department of Electronic and Electrical Engineering, University College London, WC1E 7JE (United Kingdom)
Publication Date:
OSTI Identifier:
22482224
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM ARSENIDES; APPROXIMATIONS; CRYOSTATS; ELECTRIC CONTACTS; MULTIPLEXERS; OSCILLATIONS; QUANTUM DOTS; SUBSTRATES