Observing gravitationally induced entanglement requires understanding the noise that suppresses it and determining whether that noise can be corrected. In this talk, I will discuss two recent works addressing these complementary questions.
First, I will examine the noise introduced by electromagnetic shielding [1]. Shields suppress direct electromagnetic interactions between the test masses while preserving their gravitational coupling. However, residual particle–shield interactions turn small geometric fluctuations into phase noise, imposing stringent stability requirements. Moreover, the shield’s mechanical vibrations can also mediate non-gravitational entanglement between the masses, complicating the interpretation of an observed signal.
These limitations motivate the second question: can local quantum control recover entanglement suppressed by noise? I will address this using quantum error correction for environmental localization noise and hypothetical fundamental decoherence, which cannot be removed by better isolation [2]. Perfectly correcting the leading position-localization errors also removes the leading gravitational interaction. However, imperfect correction can exploit higher-order terms to suppress noise more strongly than the interaction. For the GRW and CSL collapse models, the effective interaction-to-noise ratio can be increased without bound in principle. For the Diósi–Penrose model, this improvement is bounded in the bipartite setting considered.
Together, these works connect the identification of noise in gravitational-entanglement experiments with the possibilities and limits of correcting it.
[1] J. Bulling, M. O. E. Steiner, J. S. Pedernales and M. B. Plenio, Stability Thresholds for Gravitationally Induced Entanglement in Shielded Setups, arXiv:2604.22593.
[2] Y.-X. Wang, J. S. Pedernales and M. B. Plenio, Recoverability of Gravitational Entanglement under Decoherence, arXiv:2611.05044.