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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Implementing a universal gate set on a logical qubit encoded in an oscillator.

Reinier W Heeres1, Philip Reinhold2,3, Nissim Ofek2

  • 1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut, 06520, USA. reinier@heeres.eu.

Nature Communications
|July 23, 2017
PubMed
Summary

Researchers developed a holistic control strategy for logical qubits using precise Hamiltonian knowledge. This method achieves high-fidelity operations on superconducting cavity resonators, enhancing quantum information processing.

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Area of Science:

  • Quantum computing
  • Quantum information science

Background:

  • Logical qubits are essential for quantum error correction.
  • Precise control over complex quantum systems is challenging due to residual interactions.

Purpose of the Study:

  • To demonstrate a holistic control strategy for manipulating logical qubits.
  • To leverage accurate Hamiltonian knowledge for precise quantum operations.

Main Methods:

  • Utilized a coupled oscillator-transmon system.
  • Employed numerical techniques for controlling linear oscillators.
  • Applied a holistic control strategy exploiting Hamiltonian knowledge.

Main Results:

  • Achieved high-fidelity (98.5%, inferred) operations on a logical qubit.
  • Demonstrated decoherence-limited operations using four-component cat states.
  • Successfully manipulated a logical qubit encoded in a superconducting cavity resonator.

Conclusions:

  • The holistic control strategy effectively manipulates logical qubits.
  • Numerical techniques are powerful for controlling linear oscillators.
  • Large Hilbert spaces of oscillators can be utilized for quantum information processing.