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Microwave Circulation in an Extended Josephson Junction Ring
Dat Thanh Le1, Arkady Fedorov1,2, T M Stace1
1Analog Quantum Circuits Pty. Ltd., Ipswich, Queensland 4300, Australia.
Abstract:
Circulators are nonreciprocal devices that enable directional signal routing. Nonreciprocity, which requires time-reversal symmetry breaking, can be produced in waveguides in which the propagation medium moves relative to the waveguide at a moderate fraction of the wave speed. Motivated by this effect, here we propose a design for nonreciprocal microwave transmission based on an extended, annular Josephson junction, in which the propagation medium consists of a train of moving fluxons. We show how to harness this to build a high-quality resonant microwave circulator, and we theoretically evaluate the anticipated performance of such a device.
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