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Related Experiment Videos

Robust controlled-NOT gates from almost any interaction.

Charles D Hill1

  • 1Centre for Quantum Computer Technology, and Department of Physics, The University of Queensland, St Lucia, QLD 4072, Australia. Charles.Hill@liverpool.ac.uk

Physical Review Letters
|May 16, 2007
PubMed
Summary
This summary is machine-generated.

This study demonstrates constructing a high-fidelity controlled-NOT gate even with unknown two-qubit interactions. It shows that oscillations in solid-state qubit interactions are correctable, advancing quantum computing.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics

Background:

  • Precise knowledge of two-qubit interactions is often unavailable in quantum systems.
  • Single-qubit operations are frequently the only precisely controllable elements.

Purpose of the Study:

  • To develop a method for creating a high-fidelity controlled-NOT gate despite uncertainties in two-qubit interactions.
  • To investigate the correctability of interaction strength oscillations in solid-state qubits.

Main Methods:

  • Utilizing available single-qubit operations.
  • Developing theoretical framework to compensate for unknown interaction parameters.
  • Analyzing the impact of interaction strength oscillations.

Main Results:

  • Demonstrated the possibility of achieving arbitrarily high fidelity for a controlled-NOT gate.
  • Showcased the correctability of exchange interaction oscillations in silicon (Si) and germanium (Ge) structures.
  • Established a method robust against incomplete knowledge of qubit interactions.

Conclusions:

  • High-fidelity quantum gates are achievable even with imperfectly characterized qubit interactions.
  • Solid-state qubit systems with oscillating interactions can be utilized for quantum computation.
  • This work provides a pathway for building reliable quantum processors with less stringent interaction control.