Microwave quantum diode

Abstract

The fragile nature of quantum circuits is a major bottleneck to scalable quantum applications. Operating at cryogenic temperatures, quantum circuits are highly vulnerable to amplifier backaction and external noise. Non-reciprocal microwave devices such as circulators and isolators are used for this purpose. These devices have a considerable footprint in cryostats, limiting the scalability of quantum circuits. We present a compact microwave diode architecture, which exploits the non-linearity of a superconducting flux qubit. At the qubit degeneracy point we experimentally demonstrate a significant difference between the power levels transmitted in opposite directions. The observations align with the proposed theoretical model. At -99 dBm input power, and near the qubit-resonator avoided crossing region, we report the transmission rectification ratio exceeding 90% for a 50 MHz wide frequency range from 6.81 GHz to 6.86 GHz, and over 60% for the 250 MHz range from 6.67 GHz to 6.91 GHz. The presented architecture is compact, and easily scalable towards multiple readout channels, potentially opening up diverse opportunities in quantum information, microwave read-out and optomechanics.

arXiv comment13 pages, 8 figures

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Cited by in corpus (13)

• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• Back-action supercurrent diodes
• Applications of Superconductor-Normal Metal Interfaces
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Scattering theory of thermal and bipolar thermoelectric diodes
• All-thermal reversal of heat currents using qutrits
• Heat transport in the quantum Rabi model: Universality and ultrastrong coupling effects
• Photonic heat transport through a Josephson junction in a resistive environment
• Quantum noise induced nonreciprocity for single photon transport in parity-time symmetric systems
• Supercurrent diode with high winding vortex
• Diode effect in the Fraunhofer pattern of disordered planar Josephson junctions
• Quantum heat transport and effects of quantum thermal devices in noncommuting coupled spins
• Microwave Circulation in an Extended Josephson Junction Ring