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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Flux-dependent crossover between quantum and classical behavior in a dc SQUID.

S Butz¹, A K Feofanov¹, K G Fedorov²

¹Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.

Physical Review Letters

|December 27, 2014

Summary

The quantum Münchhausen effect was observed in a superconducting circuit. Macroscopic quantum tunneling and thermal escape were found to alternate, demonstrating quantum-facilitated system escape.

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Area of Science:

Condensed Matter Physics
Quantum Mechanics
Superconductivity

Background:

The Münchhausen effect describes how a quantum degree of freedom can enable a coupled system's escape.
This phenomenon has been theoretically predicted but experimentally challenging to demonstrate.

Purpose of the Study:

To experimentally implement and verify the Münchhausen effect in a physical system.
To investigate the interplay between quantum and classical escape dynamics.

Main Methods:

A dc SQUID (Superconducting Quantum Interference Device) was modified by shunting one junction with an additional capacitor.
The escape dynamics of this coupled classical-quantum system were studied under varying external magnetic flux.

Main Results:

A crossover between quantum and classical escape processes was observed.
Macroscopic quantum tunneling and thermally activated escape were found to periodically alternate with changes in magnetic flux.

Conclusions:

The experimental results provide evidence for the Münchhausen effect.
The study demonstrates the controllable interplay between quantum tunneling and thermal escape in a superconducting circuit.