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Ultrafast quantum computation in ultrastrongly coupled circuit QED systems
Yimin Wang1,2, Chu Guo3, Guo-Qiang Zhang2
1College of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, China.
Scientific Reports
|March 11, 2017
Summary
This study accelerates quantum computing by proposing a new scheme for a two-qubit phase gate in circuit quantum electrodynamics (QED) systems. The novel approach utilizes ultrastrong coupling and auxiliary resonators to enhance speed and reduce noise tolerance.
Area of Science:
- Quantum Physics
- Quantum Optics
- Quantum Computing
Background:
- Circuit quantum electrodynamics (QED) systems have advanced significantly, enabling the ultrastrong-coupling regime.
- This regime predicts novel quantum optics phenomena and potential computational advantages.
Purpose of the Study:
- To propose a scheme for accelerating a nontrivial two-qubit phase gate in circuit QED systems.
- To reduce the coupling strength requirement for achieving a controlled-phase gate.
Main Methods:
- Utilizing superconducting flux qubits ultrastrongly coupled to a transmission line resonator (TLR).
- Employing two additional TLRs coupled to the main system for assistance.
- Achieving the phase gate via close-loop displacements of three-mode intracavity fields.
Main Results:
- Demonstrated an unconventional geometric phase gate between two flux qubits.
- Showcased that using three resonators reduces the required coupling strength for the two-qubit gate.
- Proposed further reduction of coupling strength by adding auxiliary resonators.
Conclusions:
- The proposed scheme offers ultrafast and noise-tolerant two-qubit gates.
- Geometric phases provide inherent advantages for quantum computation robustness.
- The method is validated with realistic parameters, considering imperfect controls and environmental noise.
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