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Quantum information tapping using a fiber optical parametric amplifier with noise figure improved by correlated
Xueshi Guo1, Xiaoying Li1, Nannan Liu1
1College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information Technology, Ministry of Education, Tianjin, 300072, P. R. China.
Scientific Reports
|July 27, 2016
Summary
Researchers developed a quantum information tap using a fiber optical parametric amplifier (FOPA) to reduce noise in quantum communication. This device surpasses classical information transfer limits, enabling efficient quantum information distribution.
Area of Science:
- Quantum optics
- Quantum information science
- Optical communications
Background:
- Distributing classical information is straightforward due to its copyable nature.
- Quantum information distribution faces challenges with added quantum noise during state distribution.
Purpose of the Study:
- To experimentally demonstrate a quantum information tap.
- To reduce noise in quantum information distribution using a fiber optical parametric amplifier (FOPA).
Main Methods:
- Utilized a FOPA with correlated inputs to leverage destructive quantum interference.
- Employed quantum entanglement between signal and idler input fields to reduce noise.
- Measured the noise figure of the FOPA and compared it to a regular FOPA.
Main Results:
- Observed a noise figure improvement of 0.7 ± 0.1 dB (signal) and 0.84 ± 0.09 dB (idler).
- The quantum information splitter achieved a total information transfer coefficient (Ts+Ti) of 1.5 ± 0.2, exceeding the classical limit of 1.
- The device operates at the 1550 nm telecom band, ensuring compatibility with existing fiber-optical networks.
Conclusions:
- The demonstrated quantum information tap effectively reduces noise in quantum information distribution.
- The device surpasses classical information transfer limits, offering enhanced capabilities for quantum networks.
- Its compatibility with current fiber-optical infrastructure facilitates practical implementation for quantum information distribution.
