TY - JOUR
T1 - Dynamical phase and quantum heat at fractional frequencies
AU - Thomas, George
AU - Pekola, Jukka P.
N1 - Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2023/4
Y1 - 2023/4
N2 - We demonstrate a genuine quantum feature of heat: the power emitted by a qubit (quantum two-level system) into a reservoir under continuous driving shows peaks as a function of frequency f. These resonant features appear due to the accumulation of the dynamical phase during the driving. The position of the nth maximum is given by f=fM/n, where fM is the mean frequency of the qubit in the cycle, and their positions are independent of the form of the drive and the number of heat baths attached, and even the presence or absence of spectral filtering. We show that the waveform of the drive determines the intensity of the peaks, differently for odd and even resonances. This quantum heat is expected to play a crucial role in the performance of driven thermal devices such as quantum heat engines and refrigerators. We also show that, by optimizing the cycle protocol, we recover the favorable classical limit in fast driven systems without the use of counterdiabatic drive protocols, and we demonstrate an entropy preserving nonunitary process. We propose that this non-trivial quantum heat can be detected by observing the steady-state power absorbed by a resistor acting as a bolometer attached to a driven superconducting qubit.
AB - We demonstrate a genuine quantum feature of heat: the power emitted by a qubit (quantum two-level system) into a reservoir under continuous driving shows peaks as a function of frequency f. These resonant features appear due to the accumulation of the dynamical phase during the driving. The position of the nth maximum is given by f=fM/n, where fM is the mean frequency of the qubit in the cycle, and their positions are independent of the form of the drive and the number of heat baths attached, and even the presence or absence of spectral filtering. We show that the waveform of the drive determines the intensity of the peaks, differently for odd and even resonances. This quantum heat is expected to play a crucial role in the performance of driven thermal devices such as quantum heat engines and refrigerators. We also show that, by optimizing the cycle protocol, we recover the favorable classical limit in fast driven systems without the use of counterdiabatic drive protocols, and we demonstrate an entropy preserving nonunitary process. We propose that this non-trivial quantum heat can be detected by observing the steady-state power absorbed by a resistor acting as a bolometer attached to a driven superconducting qubit.
UR - http://www.scopus.com/inward/record.url?scp=85163426070&partnerID=8YFLogxK
U2 - 10.1103/PhysRevResearch.5.L022036
DO - 10.1103/PhysRevResearch.5.L022036
M3 - Other journal contribution
AN - SCOPUS:85163426070
SN - 2643-1564
VL - 5
JO - Physical review research
JF - Physical review research
IS - 2
M1 - L022036
ER -