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Dephasing-Insensitive Quantum Information Storage and Processing with Superconducting Qubits.

Qiujiang Guo1, Shi-Biao Zheng2, Jianwen Wang3

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

Physical Review Letters
|October 13, 2018
PubMed
Summary
This summary is machine-generated.

We developed a dephasing-insensitive method for quantum computing using superconducting qubits. This technique protects quantum information during storage and two-qubit gate operations, crucial for practical quantum computers.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Protecting qubits from decoherence is essential for practical quantum computers.
  • High-fidelity entangling gates are necessary for complex quantum computations.
  • Frequency-tunable superconducting qubits offer control but can be susceptible to dephasing.

Purpose of the Study:

  • To propose and demonstrate a dephasing-insensitive procedure for quantum information processing.
  • To develop a method for protecting individual qubits from dephasing noise.
  • To realize a two-qubit phase gate with inherent dynamical decoupling.

Main Methods:

  • Utilizing an all-to-all connected superconducting circuit with multiple frequency-tunable qubits.
  • Applying a weak continuous resonant driving field with phase reversal for dynamic decoupling of individual qubits.
  • Combining continuous driving with qubit-qubit swapping coupling to create a two-qubit phase gate.

Main Results:

  • Demonstrated dynamic decoupling of individual qubits from dephasing noise.
  • Successfully realized a two-qubit phase gate with inherent dynamical decoupling.
  • Showed that continuous driving fields protect qubits from dephasing during gate operations.

Conclusions:

  • The proposed procedure offers a dephasing-insensitive method for quantum information storage and processing.
  • This technique enhances the robustness of superconducting qubits against environmental noise.
  • The developed two-qubit gate is vital for advancing the construction of practical quantum computers.