Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED

Abstract

A chiral photonic interface is a quantum system that has different probabilities for emitting photons to the left and right. An on-chip compatible chiral interface is attractive for both fundamental studies of light-matter interactions and applications to quantum information processing. We propose such a chiral interface based on superconducting circuits, which has wide bandwidth, rich tunability, and high tolerance to fabrication variations. The proposed interface consists of a core that uses Cooper-pair boxes (CPBs) to break time-reversal symmetry, and two superconducting transmons that connect the core to a waveguide in the manner reminiscent of a ``giant atom.'' The transmons form a state decoupled from the core, akin to dark states of atomic physics, rendering the whole interface insensitive to the CPB charge noise. The proposed interface can be extended to realize a broadband fully passive on-chip circulator for microwave photons.

arXiv commentmain text (6 pages, 4 figures), supplemental material (8 pages, 5 figures, 1 table)

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Cited by in corpus (6)

• Chiral Quantum Network with Giant Atoms
• Giant spin ensembles in waveguide magnonics
• Passive superconducting circulator on a chip
• Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide
• Chiral SQUID-metamaterial waveguide for circuit-QED
• All-optical control of thermal conduction in waveguide QED