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Related Experiment Video

Updated: Jul 18, 2026

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

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

Published on: August 2, 2019

Phonon squeezing in a superconducting molecular transistor.

A Zazunov¹, D Feinberg, T Martin

¹Laboratoire de Physique et Modélisation des Milieux Condensés, Université Joseph Fourier, B.P. 166, 38042 Grenoble, France.

Physical Review Letters

|December 13, 2006

Summary

We studied Josephson transport in molecular junctions with vibrations. The superconducting current squeezes the vibrational mode, creating nonclassical states controllable by junction properties.

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Area of Science:

Quantum transport
Molecular electronics
Condensed matter physics

Background:

Josephson transport is crucial for superconducting devices.
Molecular junctions offer tunable electronic properties.
Vibrational modes can influence charge transport.

Purpose of the Study:

Investigate Josephson transport through molecular junctions coupled to vibrations.
Analyze the impact of vibrational modes on superconducting current.
Explore the creation of nonclassical phonon states.

Main Methods:

Exact ground-state solution in the large superconducting gap limit.
Variational analysis to extend the solution.
Theoretical modeling of Josephson current and phonon squeezing.

Main Results:

Josephson current induces squeezing of the local phonon mode.
Phonon squeezing is controllable via superconducting phase difference.
Junction asymmetry significantly affects phonon squeezing.
Nonclassical phonon states can be generated.

Conclusions:

Vibrational modes play a key role in molecular Josephson junctions.
Tunable phonon squeezing offers potential for quantum control.
Optical probes can detect nonclassical phonon states.