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Quantum Coherent Feedback Control for Generation System of Optical Entangled State.
Yaoyao Zhou1, Xiaojun Jia1, Fang Li1
1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, P. R. China.
Scientific Reports
|June 6, 2015
Summary
Coherent feedback control (CFC) enhances quantum entanglement in optical systems. This method improves entanglement and reduces the threshold pump power in non-degenerate optical parametric amplifiers (NOPAs).
Area of Science:
- Quantum optics
- Quantum information science
- Nonlinear optics
Background:
- Coherent feedback control (CFC) is a non-measurement based technique.
- CFC is suitable for manipulating quantum optical systems and preparing nonclassical states of light.
- It avoids introducing backaction noise into the controlled system.
Purpose of the Study:
- To improve the quantum entanglement degree of an optical entangled state.
- To reduce the threshold pump power of a non-degenerate optical parametric amplifier (NOPA).
Main Methods:
- Utilizing a non-degenerate optical parametric amplifier (NOPA).
- Implementing a coherent feedback control (CFC) loop.
- Tuning the transmissivity of an optical controller within the CFC loop.
Main Results:
- The quantum entanglement degree of the output optical entangled state was improved.
- The threshold pump power of the NOPA was reduced.
- Experimental results showed reasonable agreement with theoretical expectations.
Conclusions:
- Coherent feedback control (CFC) is an effective method for enhancing quantum entanglement.
- The CFC technique can optimize the performance of non-degenerate optical parametric amplifiers (NOPAs).
- This approach offers a promising route for generating high-quality quantum states of light.
