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Sequential state discrimination of coherent states
1Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do, 425-791, South Korea. mslab.nk@gmail.com.
Scientific Reports
|November 18, 2018
Summary
We propose optical designs for sequential state discrimination of quantum coherent states. This method offers improved performance over quantum cloning and aids in multiparty quantum key distribution.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Quantum Communication
Background:
- Sequential state discrimination is crucial for quantum communication with multiple receivers.
- Existing methods may lack practicality for general coherent states or require complex setups.
Purpose of the Study:
- To propose novel optical designs for sequential state discrimination of two coherent states.
- To evaluate the performance of these designs for general coherent states, including binary phase-shifting-key (BPSK) signals.
- To assess the feasibility of the proposed designs in realistic scenarios with photon loss.
Main Methods:
- Development of optical designs for sequential discrimination without electrical feedback.
- Analysis of the proposed designs considering arbitrary prior probabilities and photon loss.
- Comparative study against probabilistic quantum cloning strategies.
Main Results:
- The proposed optical designs enable sequential state discrimination of two coherent states.
- The designs are implementable without complex electrical feedback systems.
- Demonstrated superior performance compared to probabilistic quantum cloning, even with photon loss.
Conclusions:
- The proposed optical designs provide a practical approach for sequential state discrimination.
- This work facilitates advancements in multiparty quantum key distribution (QKD) using coherent states.
- The findings pave the way for more robust and scalable quantum communication networks.
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