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Theory of double Cooper-pair tunneling and light emission mediated by a resonator

Morley, W. T.; Di Marco, A.; Mantovani, M.; Stadler, P.; Belzig, W.; Rastelli, G.; Armour, Andrew

Authors

W. T. Morley

A. Di Marco

M. Mantovani

P. Stadler

W. Belzig

G. Rastelli

Andrew Armour



Abstract

Photon emission by tunneling electrons can be encouraged by locating a resonator close to the tunnel junction and applying an appropriate voltage-bias. However, studies of normal metals show that the resonator also affects how the charges flow, facilitating processes in which correlated tunneling of two charges produces one photon. We develop a theory to analyze this kind of behavior in Josephson junctions by deriving an effective Hamiltonian describing processes where two Cooper-pairs generate a single photon. We determine the conditions under which the transport is dominated by incoherent tunneling of two Cooper-pairs, whilst also uncovering a regime of coherent double Cooper-pair tunneling. We show that the system can also display an unusual form of photon-blockade and hence could serve as a single-photon source.

Journal Article Type Article
Publication Date Aug 1, 2019
Print ISSN 2469-9950
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 100
Issue 5
Article Number 054515
APA6 Citation Morley, W. T., Di Marco, A., Mantovani, M., Stadler, P., Belzig, W., Rastelli, G., & Armour, A. (2019). Theory of double Cooper-pair tunneling and light emission mediated by a resonator. Physical Review B, 100(5),
Publisher URL https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.054515

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