Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2304.05806 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909419588026368 |
|---|---|
| author | Kuzmin, Roman Mehta, Nitish Grabon, Nicholas Mencia, Raymond A. Burshtein, Amir Goldstein, Moshe Manucharyan, Vladimir E. |
| author_facet | Kuzmin, Roman Mehta, Nitish Grabon, Nicholas Mencia, Raymond A. Burshtein, Amir Goldstein, Moshe Manucharyan, Vladimir E. |
| contents | Although quantum mechanics applies to many macroscopic superconducting devices, one basic prediction remained controversial for decades. Namely, a Josephson junction connected to a resistor must undergo a dissipation-induced quantum phase transition from superconductor to insulator once the resistor's value exceeds $h/4e^2 \approx 6.5~\textrm{k}Ω$ ($h$ is Planck's constant, $e$ is the electron charge). Here we finally demonstrate this transition by observing the resistor's internal dynamics. Implementing our resistor as a long transmission line section, we find that a junction scatters electromagnetic excitations in the line as either inductance (superconductor) or capacitance (insulator), depending solely on the line's wave impedance. At the phase boundary, the junction itself acts as ideal resistance: in addition to elastic scattering, incident photons can spontaneously down-convert with a frequency-independent probability, which provides a novel marker of quantum-critical behavior. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_05806 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of the Schmid-Bulgadaev dissipative quantum phase transition Kuzmin, Roman Mehta, Nitish Grabon, Nicholas Mencia, Raymond A. Burshtein, Amir Goldstein, Moshe Manucharyan, Vladimir E. Quantum Physics Superconductivity Although quantum mechanics applies to many macroscopic superconducting devices, one basic prediction remained controversial for decades. Namely, a Josephson junction connected to a resistor must undergo a dissipation-induced quantum phase transition from superconductor to insulator once the resistor's value exceeds $h/4e^2 \approx 6.5~\textrm{k}Ω$ ($h$ is Planck's constant, $e$ is the electron charge). Here we finally demonstrate this transition by observing the resistor's internal dynamics. Implementing our resistor as a long transmission line section, we find that a junction scatters electromagnetic excitations in the line as either inductance (superconductor) or capacitance (insulator), depending solely on the line's wave impedance. At the phase boundary, the junction itself acts as ideal resistance: in addition to elastic scattering, incident photons can spontaneously down-convert with a frequency-independent probability, which provides a novel marker of quantum-critical behavior. |
| title | Observation of the Schmid-Bulgadaev dissipative quantum phase transition |
| topic | Quantum Physics Superconductivity |
| url | https://arxiv.org/abs/2304.05806 |