Generating two continuous entangled microwave beams using a dc-biased
Josephson junction
- URL: http://arxiv.org/abs/2010.03376v1
- Date: Wed, 7 Oct 2020 12:44:34 GMT
- Title: Generating two continuous entangled microwave beams using a dc-biased
Josephson junction
- Authors: A. Peugeot, G. M\'enard, S. Dambach, M. Westig, B. Kubala, Y.
Mukharsky, C. Altimiras, P. Joyez, D. Vion, P. Roche, D. Esteve, P. Milman,
J. Lepp\"akangas, G. Johansson, M. Hofheinz, J. Ankerhold, F. Portier
- Abstract summary: A dc-biased Josephson junction in series with two microwave resonators emits entangled beams of microwaves leaking out of the resonators.
We measure second-order coherence functions for proving entanglement up to an emission rate of 2.5 billion photon pairs per second.
This agreement allows us to evaluate the entropy of entanglement of the resonators, and to identify the improvements that could bring this device closer to a useful bright source of entangled microwaves for quantum-technological applications.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We show experimentally that a dc-biased Josephson junction in series with two
microwave resonators emits entangled beams of microwaves leaking out of the
resonators. In the absence of a stationary phase reference for characterizing
the entanglement of the outgoing beams, we measure second-order coherence
functions for proving entanglement up to an emission rate of 2.5 billion photon
pairs per second. The experimental results are found in quantitative agreement
with theory, proving that the low frequency noise of the dc bias is the main
limitation for the coherence time of the entangled beams. This agreement allows
us to evaluate the entropy of entanglement of the resonators, and to identify
the improvements that could bring this device closer to a useful bright source
of entangled microwaves for quantum-technological applications.
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