Quantum Batteries as Work Sources for Phase-Locked Parametric Amplification
Abstract
Quantum batteries have been proposed as locally precharged work sources for superconducting quantum technologies, suggesting a route to reduce continuously supplied microwave drives. Here we ask whether the pump tone of a quantum-limited parametric amplifier can be replaced, or strongly duty-cycled, by a finite bosonic quantum battery. Quantizing the pump of a nondegenerate parametric amplifier exposes a resource distinction hidden in the classical description: stored pump energy can generate signal-idler photons, but pump phase coherence is required to generate a phase-locked amplifier field. In a closed trilinear model, coherent and phase-randomized coherent pumps with the same photon-number distribution produce comparable pair numbers, yet only the coherent pump produces anomalous two-mode coherence and an EPR-squeezed interference dip. Including leakage, we collect the emitted fields into cascaded temporal modes. At matched collector bandwidth, the coherent pump gives Imin(f)=0.553, whereas the phase-randomized pump gives Imin(f)=1.94 at nearly identical collected energy. Weak amplitude squeezing slightly improves the dip by reducing finite-pump number fluctuations while preserving the coherent displacement. Thus battery-powered parametric amplification requires phase-coherent stored energy, possibly assisted by number-noise reduction, rather than stored energy alone.
Versions
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BibTeX
@misc{ahmadi2026quantum,
title = {{Quantum Batteries as Work Sources for Phase-Locked Parametric Amplification}},
author = {Borhan Ahmadi},
howpublished = {arXiv},
year = {2026},
month = jun,
doi = {10.48550/arxiv.2606.20306},
eprint = {2606.20306},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.20306},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Quantum Batteries as Work Sources for Phase-Locked Parametric Amplification
AU - Borhan Ahmadi
PY - 2026
DA - 2026/06/18
PB - arXiv
DO - 10.48550/arxiv.2606.20306
UR - https://arxiv.org/abs/2606.20306
AB - Quantum batteries have been proposed as locally precharged work sources for superconducting quantum technologies, suggesting a route to reduce continuously supplied microwave drives. Here we ask whether the pump tone of a quantum-limited parametric amplifier can be replaced, or strongly duty-cycled, by a finite bosonic quantum battery. Quantizing the pump of a nondegenerate parametric amplifier exposes a resource distinction hidden in the classical description: stored pump energy can generate signal-idler photons, but pump phase coherence is required to generate a phase-locked amplifier field. In a closed trilinear model, coherent and phase-randomized coherent pumps with the same photon-number distribution produce comparable pair numbers, yet only the coherent pump produces anomalous two-mode coherence and an EPR-squeezed interference dip. Including leakage, we collect the emitted fields into cascaded temporal modes. At matched collector bandwidth, the coherent pump gives I_min^(f)=0.553, whereas the phase-randomized pump gives I_min^(f)=1.94 at nearly identical collected energy. Weak amplitude squeezing slightly improves the dip by reducing finite-pump number fluctuations while preserving the coherent displacement. Thus battery-powered parametric amplification requires phase-coherent stored energy, possibly assisted by number-noise reduction, rather than stored energy alone.
ER -