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TT: Fachverband Tiefe Temperaturen
TT 37: Transport: Fluctuation and Noise
(Joint session of DY and TT organized by TT)
TT 37.4: Talk
Tuesday, March 8, 2016, 14:45–15:00, H23
Time-resolved statistics of entangled photon pairs in Josephson photonics — •Simon Dambach, Björn Kubala, and Joachim Ankerhold — Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany
The interplay of the tunneling transfer of charges and the emission and absorption of light can be investigated in a setup where a voltage-biased Josephson junction is placed in series to a microwave resonator. Such circuits combine phenomena and observational tools originally known from the fields of charge transfer physics and quantum optics (Josephson photonics). Due to the inherent nonlinearity of the Josephson junction, tunneling Cooper pairs can create a variety of nonclassical states of light. This is reflected in form of characteristic signatures in the second-order correlation function g(2)(τ) and the waiting-time distribution w(τ). We find that this device represents a versatile source of nonconventional light which can be tuned from photon-pair creation and strong bunching to single-photon creation and complete antibunching [1].
In this talk, we will investigate theoretically the simultaneous creation of two photons within different modes and, in particular, address the question of intermode entanglement by means of different entanglement witnesses.
[1] S. Dambach et al., PRB 92, 054508 (2015).