Measurement-induced disturbances in entangled coherent states

Determine how measurement-induced disturbances affect the sensitivity and intrinsic properties of entangled coherent states under post-selected von Neumann measurements.

Background

The paper studies two-mode entangled coherent states (ECSs), which combine coherent-state superposition with mode entanglement and exhibit nonclassical properties such as squeezing, EPR correlations, and non-Poissonian photon statistics. Because these states are intended as resources for quantum communication, coherent-state information processing, and quantum metrology, understanding their response to measurement back-action is important.

The authors explicitly identify the sensitivity of ECSs to measurement-induced disturbances as unresolved. Their subsequent analysis examines how post-selected von Neumann measurements modify squeezing, photon statistics, intermode correlations, entanglement criteria, fidelity, and post-selection probability, but the quoted passage frames the broader sensitivity question as an open problem.

References

Nevertheless, their sensitivity to measurement-induced disturbances remains an open question \citep{PhysRevA.70.020101}.

— Harnessing Post-selected von Neumann Measurements to Strengthen Entanglement and Quantum Signatures in Coherent States  (2610.08438 - Yuanbek et al., 6 Oct 2026) in Introduction, paragraph 3

Future work will incorporate photon loss and dephasing, \citep{Ding2025,Wen2026}, finite detection efficiency, and imperfect post-selection \citep{Mei2026}. It will also identify experimentally accessible parameter regimes in which the predicted non-classical enhancement remains observable at finite post-selection probability \citep{science.aaa2085,PhysRevA.110.062217,Yuanbek2026}.

— Harnessing Post-selected von Neumann Measurements to Strengthen Entanglement and Quantum Signatures in Coherent States  (2610.08438 - Yuanbek et al., 6 Oct 2026) in Conclusion and Outlook, Section 8