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Title: Quantum logic gates from time-dependent global magnetic field in a system with constant exchange

We propose a method that implements a universal set of one- and two-quantum-bit gates for quantum computation in a system of coupled electron pairs with constant non-diagonal exchange interaction. In our proposal, suppression of the exchange interaction is performed by the continual repetition of single-spin rotations. A small g-factor difference between the electrons allows for addressing qubits and avoiding strong magnetic field pulses. Numerical experiments were performed to show that, to implement the one- and two-qubit operations, it is sufficient to change the strength of the magnetic field by a few Gauss. This introduces one and then the other electron in a resonance. To determine the evolution of the two-qubit system, we use the algorithms of optimal control theory.
Authors:
;  [1] ;  [2] ;  [1] ; ;  [3]
  1. Rzhanov Institute of Semiconductor Physics SB RAS, 630090 Novosibirsk (Russian Federation)
  2. (Russian Federation)
  3. Institute for System Dynamics and Control Theory SB RAS, 664033 Irkutsk (Russian Federation)
Publication Date:
OSTI Identifier:
22399304
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 11; 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; ALGORITHMS; ELECTRON PAIRS; ELECTRONS; EXCHANGE INTERACTIONS; LANDE FACTOR; MAGNETIC FIELDS; OPTIMAL CONTROL; QUANTUM COMPUTERS; QUBITS; ROTATION; SPIN; TIME DEPENDENCE