1. Heat Bath in a Quantum Circuit
- Author
-
Jukka P. Pekola and Bayan Karimi
- Subjects
heat bath ,superconducting circuit ,resonator ,Josephson array ,resistor ,Science ,Astrophysics ,QB460-466 ,Physics ,QC1-999 - Abstract
We discuss the concept and realization of a heat bath in solid state quantum systems. We demonstrate that, unlike a true resistor, a finite one-dimensional Josephson junction array or analogously a transmission line with non-vanishing frequency spacing, commonly considered as a reservoir of a quantum circuit, does not strictly qualify as a Caldeira–Leggett type dissipative environment. We then consider a set of quantum two-level systems as a bath, which can be realized as a collection of qubits. We show that only a dense and wide distribution of energies of the two-level systems can secure long Poincare recurrence times characteristic of a proper heat bath. An alternative for this bath is a collection of harmonic oscillators, for instance, in the form of superconducting resonators.
- Published
- 2024
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