期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.250502
关键词
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资金
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 631]
- German excellence initiative via the Nanosystems Initiative Munich (NIM)
- EU project SOLID
- EU project CCQED
- EU project PROMISCE
- MEXT Kakenhi Quantum Cybernetics
- JSPS through its FIRST Program
- Project for Developing Innovation Systems of MEXT
- NICT Commissioned Research
- EPSRC [EP/H050434/1]
- Basque Government [IT472-10]
- Spanish MICINN [FIS2009-12773-C02-01]
Path entanglement constitutes an essential resource in quantum information and communication protocols. Here, we demonstrate frequency-degenerate entanglement between continuous-variable quantum microwaves propagating along two spatially separated paths. We combine a squeezed and a vacuum state using a microwave beam splitter. Via correlation measurements, we detect and quantify the path entanglement contained in the beam splitter output state. Our experiments open the avenue to quantum teleportation, quantum communication, or quantum radar with continuous variables at microwave frequencies.
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