Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED

• URL: http://arxiv.org/abs/2106.15744v2
• Date: Wed, 1 Dec 2021 13:48:51 GMT
• Title: Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED
• Authors: Yu-Xiang Zhang, Carles R. i Carceller, Morten Kjaergaard, Anders S. S{\o}rensen
• Abstract summary: 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 can be extended to realize a broadband fully passive on-chip circulator for microwave photons.
• Score: 6.422921106366847
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• 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.

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