Energy Down Conversion between Classical Electromagnetic Fields via a Quantum Mechanical SQUID Ring

Details Energy Down Conversion between Classical Electromagnetic Fields via a Quantum Mechanical SQUID Ring Energy Down Conversion between Classical Electromagnetic Fields via a Quantum Mechanical SQUID Ring

2005-05-16

arxiv.org/abs/cond-mat/0505390v1

PHYSICAL REVIEW B 72, 094509 (2005)

Physics

Condensed Matter

Superconductivity

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.72.094509

We consider the interaction of a quantum mechanical SQUID ring with a classical resonator (a parallel $LC$ tank circuit). In our model we assume that the evolution of the ring maintains its quantum mechanical nature, even though the circuit to which it is coupled is treated classically. We show that when the SQUID ring is driven by a classical monochromatic microwave source, energy can be transferred between this input and the tank circuit, even when the frequency ratio between them is very large. Essentially, these calculations deal with the coupling between a single macroscopic quantum object (the SQUID ring) and a classical circuit measurement device where due account is taken of the non-perturbative behaviour of the ring and the concomitant non-linear interaction of the ring with this device.

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