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Universal quantum gates for photon-atom hybrid systems assisted by bad cavities
Guan-Yu Wang1, Qian Liu1, Hai-Rui Wei2
1Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Scientific Reports
|April 13, 2016
Summary
We developed simple, high-fidelity CNOT and Toffoli quantum gates using photon-atom systems and bad cavities. These hybrid quantum gates are efficient and suitable for quantum communication networks.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Quantum Communication
Background:
- Implementing quantum gates, such as CNOT and Toffoli, is crucial for quantum computation and communication.
- Hybrid quantum systems offer potential advantages but often face experimental challenges.
- Previous methods frequently require auxiliary qubits and complex measurement setups.
Purpose of the Study:
- To present deterministic schemes for constructing CNOT and Toffoli gates.
- To utilize photon-atom and photon-atom-atom hybrid systems assisted by bad cavities.
- To simplify gate implementation and enhance feasibility with current experimental technology.
Main Methods:
- Cavity-assisted photon scattering in the intermediate coupling region with bad cavities.
- Developing deterministic schemes for CNOT and Toffoli gates without auxiliary qubits or measurements.
- Utilizing simple schematic setups, including a quarter wave packet for the Toffoli gate interaction.
Main Results:
- Achieved high average fidelities and efficiencies for both CNOT and Toffoli gates.
- Demonstrated schemes that do not require auxiliary qubits or measurements, simplifying implementation.
- Showcased the feasibility of using bad cavities for fast quantum operations and readout.
Conclusions:
- The proposed schemes provide efficient and high-fidelity universal hybrid quantum gates.
- These atom-cavity systems are suitable as quantum nodes for long-distance quantum communication due to long coherence times.
- The simplified experimental requirements make these gates highly promising for practical realization.
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