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Heralded amplification of nonlocality via entanglement swapping
- Source :
- New Journal of Physics. 22:023008
- Publication Year :
- 2020
- Publisher :
- IOP Publishing, 2020.
-
Abstract
- To observe the loophole-free violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality between distant two parties, i.e. the CHSH value S > 2 , the main limitation of distance stems from the loss in the transmission channel. The entanglement swapping relay (ESR) is a simple way to amplify the signal and enables us to evade the impact of the transmission loss. Here, we experimentally test the heralded nonlocality amplifier protocol based on the ESR. We observe that the obtained probability distribution is in excellent agreement with those expected by the numerical simulation with experimental parameters which are precisely characterized in a separate measurement. Moreover, we experimentally estimate the nonlocality of the heralded state after the transmission of 10 dB loss just before final detection. The estimated CHSH value is S = 2.113 > 2 , which indicates that our final state possesses nonlocality even with transmission loss and various experimental imperfections. Our result clarifies an important benchmark of the ESR protocol, and paves the way towards the long-distance realization of the loophole-free CHSH-violation as well as device-independent quantum key distribution.
- Subjects :
- Physics
Transmission loss
General Physics and Astronomy
Quantum entanglement
Quantum key distribution
01 natural sciences
010305 fluids & plasmas
Quantum nonlocality
Spontaneous parametric down-conversion
Transmission (telecommunications)
Bell's theorem
Quantum mechanics
0103 physical sciences
Probability distribution
010306 general physics
Subjects
Details
- ISSN :
- 13672630
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- New Journal of Physics
- Accession number :
- edsair.doi...........4341db1e48d93a13df255eb0a3c980f6