Abstract
A minimally invasive technique is proposed for detecting spin current noise across a junction between two quantum magnets using a high-quality microwave resonator coupled to a transmission line which is impedance matched to a photon detector downstream. Photons in the microwave resonator couple inductively to the spins in the spin subsystem, and the noise in the junction spin current imprints itself into the output photons propagating along the transmission line. The technique is capable of extracting both the dc and finite frequency noise via the output photon flux and also opens doors to the studies of photon counting statistics and to the possible generation of nonclassical radiation produced by spin current fluctuations at a quantum magnet junction.
- Received 7 February 2019
- Revised 27 March 2019
DOI:https://doi.org/10.1103/PhysRevB.99.174422
©2019 American Physical Society