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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Continuous-variable geometric phase and its manipulation for quantum computation in a superconducting circuit.

Chao Song1, Shi-Biao Zheng2, Pengfei Zhang1

  • 1Department of Physics, Zhejiang University, Hangzhou, Zhejiang, 310027, China.

Nature Communications
|October 24, 2017
PubMed
Summary
This summary is machine-generated.

Researchers observed a continuous-variable geometric phase in superconducting circuits, enabling a novel quantum gate protocol. This geometric approach offers a simplified, noise-resilient method for implementing multi-qubit gates, outperforming traditional techniques.

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Area of Science:

  • Quantum Mechanics
  • Quantum Information Science
  • Superconducting Circuits

Background:

  • Geometric phase, arising from holonomy in quantum state space, is a fundamental quantum effect.
  • Geometric quantum computation leverages this phase for noise-resilient quantum logic operations.
  • Current methods for multi-qubit gates often involve complex decomposition, increasing implementation steps.

Purpose of the Study:

  • To observe continuous-variable geometric phase in a superconducting circuit.
  • To demonstrate a quantum gate protocol utilizing this geometric phase.
  • To showcase the efficiency of geometric manipulation for multi-qubit gates.

Main Methods:

  • Utilized a superconducting circuit with five controllably coupled qubits and a resonator.
  • Implemented a quantum gate protocol based on the observed continuous-variable geometric phase.
  • Performed experiments to realize n-qubit controlled-phase gates for n up to 4.

Main Results:

  • Successfully observed continuous-variable geometric phase.
  • Demonstrated a one-step implementation of n-qubit controlled-phase gates.
  • Achieved high efficiency in geometric manipulation for quantum computation with up to 4 qubits.

Conclusions:

  • The geometric phase approach provides a significant advantage for implementing multi-qubit gates.
  • This method simplifies gate implementation compared to dynamical approaches and gate decomposition.
  • The demonstrated protocol highlights the potential of geometric quantum computation in superconducting circuits.