Breaking time-reversal symmetry with a superconducting flux capacitor

Abstract

We present the design of a passive, on-chip microwave circulator based on a ring of superconducting tunnel junctions. We investigate two distinct physical realisations, based on either Josephson junctions (JJ) or quantum phase slip elements (QPS), with microwave ports coupled either capacitively (JJ) or inductively (QPS) to the ring structure. A constant bias applied to the center of the ring provides the symmetry breaking (effective) magnetic field, and no microwave or rf bias is required. We find that this design offers high isolation even when taking into account fabrication imperfections and environmentally induced bias perturbations and find a bandwidth in excess of 500 MHz for realistic device parameters.

10 pages, 11 figures, including supplementary material - published as "Passive on-chip, superconducting circulator using rings of tunnel junctions"

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• Charge insensitive qubit design derived from the Cooper pair box
• Chiral Quantum Optics
• Microwave photonics with superconducting quantum circuits
• Nonreciprocal Photon Transmission and Amplification via Reservoir Engineering
• Time-reversal symmetry breaking in circuit-QED based photon lattices
• Dressed Collective Qubit States and the Tavis-Cummings Model in Circuit QED
• Noiseless nonreciprocity in a parametric active device
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• Widely tunable on-chip microwave circulator for superconducting quantum circuits
• Mesoscopic one-way channels for quantum state transfer via the Quantum Hall Effect
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