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Maneuvering measurement-coherence into measurement-entanglement

Quantum Physics 2025-12-09 v3

Abstract

Quantum dynamics governs the transformation of static quantum resources, such as coherence and entanglement, in both quantum states and measurements. Prior studies have established that a quantum channel's state-cohering power can be converted into the state-entangling power without additional coherence. Here, we complete this coherence-to-entanglement paradigm by demonstrating that a channel's measurement-cohering power can likewise be converted into the measurement-entangling power. This result reinforces, on the dynamical level, the intuition that entanglement emerges as a manifestation of coherence. To formalize this picture, we develop resource theories for measurement-cohering and measurement-entangling powers and characterize the structure of incoherent measurements to analyze measurement-coherence generation. Furthermore, we show that the state-cohering power of a quantum channel is equivalent to the measurement-cohering power of its adjoint map, and a corresponding equivalence also exists between the state-entangling power and the measurement-entangling power.

Keywords

Cite

@article{arxiv.2410.20793,
  title  = {Maneuvering measurement-coherence into measurement-entanglement},
  author = {Ho-Joon Kim and Soojoon Lee},
  journal= {arXiv preprint arXiv:2410.20793},
  year   = {2025}
}

Comments

Manuscript is revised