Benchmarks for quantum communication via gravity

We establish limitations and bounds on the transmission of quantum states between gravitationally interacting mechanical oscillators under different models of gravity. This provides benchmarks that can enable tests for quantum features of gravity. Our proposal does not require the measurement of gravitationally induced entanglement and only requires final measurements of a single subsystem. We discuss bounds for classical models based on local operations and classical communication when considering coherent-state alphabets, and we discuss the transfer of quantum squeezing for falsifying the Schrödinger-Newton model.

💡 Research Summary

The paper “Benchmarks for quantum communication via gravity” develops a theoretical framework and experimental protocol for testing whether gravity can act as a genuine quantum communication channel. The authors consider two identical mechanical oscillators of mass m and frequency ω separated by a distance d and interacting only through Newtonian gravity. In the weak‑field limit ( m/d ≪ m_P/ℓ_P ) and assuming the oscillation amplitudes are much smaller than d, the gravitational interaction Hamiltonian can be expanded to first order, yielding a beam‑splitter–type coupling
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