Quantum

The noise cost of reservoir locality in broadband quantum amplifier chains

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Briefings

This study constructs adjacent-site loss channels to establish an uncapped benchmark for directional quantum amplifiers, revealing that nearest-neighbor arithmetic band average noise exceeds the unrestricted optimum by over 1.01265 quanta in uniform chains for N>=64. The research compares fixed reservoirs at matched drift, ports, high-gain band, and complete gain/loss rate caps, with results guiding cryogenic microwave array design for a 100 kHz design band.

Key points

• Nearest-neighbor arithmetic band average noise exceeds the unrestricted optimum by more than 1.01265 quanta in uniform chains for every finite N>=64.
• Fixed reservoirs at matched drift, ports, high-gain band, and complete gain/loss rate caps were compared to establish a benchmark for directional quantum amplifiers.

Context

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.

Limitations

Results are theoretical and based on finite-auxiliary calculations for N=64; noise advantage under matched total coupling budgets is retained only at N=64. The study uses untrusted data from arXiv:2610.20654v1 and does not provide experimental validation or additional background context.

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