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Quantum computing with an always-on Heisenberg interaction.

Simon C Benjamin1, Sougato Bose

  • 1Center for Quantum Computation, University of Oxford, OX1 3PU, United Kingdom.

Physical Review Letters
|July 15, 2003
PubMed
Summary
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Quantum computing can be achieved with constant qubit coupling by tuning individual qubit energies. This simplifies control to a single switch with six settings, applicable across various physical systems.

Area of Science:

  • Quantum Information Science
  • Quantum Computing Hardware

Background:

  • Quantum computing (QC) often relies on experimentally challenging methods to switch qubit couplings on and off.
  • Existing approaches face significant hurdles in practical implementation.

Purpose of the Study:

  • To demonstrate a novel quantum computing scheme using constant Heisenberg coupling.
  • To simplify quantum computation control mechanisms.
  • To propose a versatile method applicable to diverse physical qubit implementations.

Main Methods:

  • Utilizing systems with a fixed Heisenberg coupling between qubits.
  • Actively tuning the transition energies of individual qubits.
  • Collectively tuning qubits to achieve simplified computational control.

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Main Results:

  • A viable quantum computing scheme using constant qubit coupling is presented.
  • Quantum computations can be controlled with a remarkably simple "switch" requiring only six settings.
  • The proposed schemes are compatible with a broad spectrum of physical implementations.

Conclusions:

  • Constant Heisenberg coupling systems are suitable for quantum computing.
  • Active tuning of qubit transition energies offers a simplified control paradigm.
  • The developed methods provide a flexible and broadly applicable approach to quantum computation.