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Optimal filters for photon cloning with an optical amplifier
1Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Canada. bqi@physics.utoronto.ca
Optics Letters
|March 16, 2007
Summary
This study evaluates a practical quantum cloning system. Performance improves with increased input photon numbers, approaching the optimal quantum limit but initially matching random cloning fidelity.
Area of Science:
- Quantum optics
- Quantum information science
Background:
- Quantum cloning is a fundamental concept in quantum information.
- Practical implementations face challenges like spontaneous emission.
Purpose of the Study:
- To assess the performance of a practical quantum cloning scheme.
- To compare its fidelity against theoretical limits and other cloning methods.
Main Methods:
- Simulating a quantum cloning scheme with a broadband optical amplifier.
- Implementing spectral and temporal filters for spontaneous emission suppression.
Main Results:
- Fidelity is lower than random cloning for input photon numbers below one.
- Fidelity approaches the optimal quantum cloning limit as input photon number increases.
- The system demonstrates higher fidelity than state estimation-based cloning.
Conclusions:
- The practical quantum cloning scheme's performance is input-dependent.
- It offers advantages over state estimation for a limited number of clones.
- Both methods converge to the quantum limit with many clones.
