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Secure quantum remote state preparation of squeezed microwave states
S Pogorzalek1,2, K G Fedorov3,4, M Xu5,6
1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748, Garching, Germany. stefan.pogorzalek@wmi.badw.de.
Nature Communications
|June 15, 2019
Summary
This study demonstrates deterministic continuous-variable remote state preparation in microwaves, achieving high security for quantum communication. The method enables secure quantum state creation over distances using entanglement and classical communication.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Microwave Engineering
Background:
- Quantum communication offers enhanced efficiency and security compared to classical methods.
- Remote state preparation (RSP) utilizes quantum entanglement and classical communication for secure state transfer.
- Continuous-variable (CV) quantum systems offer unique advantages for quantum information processing.
Purpose of the Study:
- To experimentally realize deterministic continuous-variable remote state preparation (CV-RSP) in the microwave regime.
- To investigate the security of the implemented CV-RSP protocol.
- To demonstrate the practical application of microwave quantum states for secure communication.
Main Methods:
- Utilizing propagating two-mode squeezed microwave states.
- Employing feedforward techniques for state manipulation.
- Implementing deterministic remote state preparation over a 35 cm distance.
- Analyzing security using the one-time pad concept and von Neumann entropies.
Main Results:
- Successful experimental realization of deterministic CV-RSP in the microwave domain.
- Achieved remote preparation of squeezed states with up to 1.6 dB squeezing below the vacuum level.
- Demonstrated close-to-perfect security by comparing state entropy with conditional entropy.
Conclusions:
- Deterministic CV-RSP in the microwave regime is experimentally feasible.
- The protocol offers a high degree of security, approaching theoretical limits.
- This work paves the way for secure microwave quantum communication networks.
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