From Detection to Generation: Testing Bidirectional Gravitational Coupling in Quantum Systems. Quantum Gravity.

The physics community recognizes that ultra-precise atomic clocks "bridge quantum mechanics and general relativity" by measuring how spacetime curvature affects atomic energy levels. We argue that this acknowledged fact already constitutes an operational demonstration of quantum gravity, but the field remains trapped in a "testing" paradigm—searching for quantum gravity elsewhere instead of recognizing it in the clocks' operating mechanism. We propose a frame shift: from "clocks as tools to search for quantum gravity" to "clocks as demonstrations of operational quantum gravity." This immediately raises the question of reversibility: if Φ_g modulates quantum states (detection), then modulated quantum states should generate Φ_g-effects (generation). We present a systematic experimental program to test this bidirectional coupling using existing atomic clock technology, coherent quantum arrays, and resonant cavities. The predicted effects are at the threshold of current measurement capabilities (~10⁻²¹ - 10⁻²³ fractional frequency shifts) and can be amplified through collective coherence and resonant enhancement. Success would establish atomic clocks not merely as gravitational sensors, but as active quantum-gravitational devices, opening pathways to gravitational manipulation at the quantum scale. This preprint proposes testable experimental predictions for bidirectional quantum-gravitational coupling. The work emerged from collaborative discussions between an engineer and an AI research assistant, demonstrating the value of interdisciplinary and unconventional approaches to fundamental physics questions. We welcome feedback from the experimental atomic physics community and are open to collaboration on detailed experimental design.