The noise cost of reservoir locality in broadband quantum amplifier chains

Abstract:Directional quantum amplifiers enable weak-signal readout while protecting the source, but reservoir noise limits sensitivity. Finite-band suppression must reconcile frequency-dependent responses with fixed local couplings and finite rates. We construct adjacent-site loss channels attaining the known single-frequency minimum under local compatibility conditions, as an uncapped benchmark. For specified uniform and dimerized chains, we compare fixed reservoirs at matched drift, ports, high-gain band and complete gain/loss rate caps. At the representative cap $R=8$ and halfwidth $\Omega=0.05$, nearest-neighbor arithmetic band average noise exceeds the unrestricted optimum by more than $1.01265$ quanta in the uniform chain for every finite $N\ge64$. Boundary-response bounds give necessary rates and targets requiring range two. At $N=64$, finite-auxiliary calculations retain a noise advantage under matched total coupling budgets; response bounds quantify noise-resolution tolerances. These theoretical results guide reservoir design and noise calibration for a proposed cryogenic microwave array with a $100$ kHz design band.

Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Other Condensed Matter (cond-mat.other); Quantum Gases (cond-mat.quant-gas)

arXiv:2610.20654 [quant-ph]

(or arXiv:2610.20654v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.20654 arXiv-issued DOI via DataCite (pending registration)