Comment on White, Mutus, Dressel, et al., "Preserving entanglement during weak measurement ... " [arXiv:1504.02707]

TL;DR

This paper critically examines a prior experimental study claiming entanglement preservation during weak measurements, highlighting the need for further theoretical analysis and discussing implications for quantum foundations and cryptography.

Contribution

It provides a theoretical critique of previous experimental claims, emphasizing the importance of proper interpretation of weak measurement results.

Findings

Highlights the necessity of careful theoretical interpretation of experimental data

Discusses potential implications for quantum cryptography and foundations

Calls for further theoretical work to clarify experimental results

Abstract

In the cited paper [White, T., Mutus, J., Dressel, J. et al., "Preserving entanglement during weak measurement demonstrated with a violation of the Bell-Leggett-Garg inequality", npj Quantum Information 2, 15022 (2016), arXiv:1504.02707], experimental results were presented that clearly prove that the quantum entanglement between two qubits is preserved after weak enough measurements are performed on them. The theoretical interpretation of the reported results, however, requires further consideration. The remarks made in this paper may have serious implications both for quantum foundations and for quantum cryptography.