English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study the extent to which \psi-epistemic models for quantum measurementstatistics---models where the quantum state does not have a real, onticstatus---can explain the indistinguishability of nonorthogonal quantum states.This is done by comparing the overlap of any two quantum states with theoverlap of the corresponding classical probability distributions over onticstates in a \psi-epistemic model. It is shown that in Hilbert spaces ofdimension $d \geq 4$, the ratio between the classical and quantum overlaps inany \psi-epistemic model must be arbitrarily small for certain nonorthogonalstates, suggesting that such models are arbitrarily bad at explaining theindistinguishability of quantum states. For dimensions $d$ = 3 and 4, weconstruct explicit states and measurements that can be used experimentally toput stringent bounds on the ratio of classical-to-quantum overlaps in\psi-epistemic models, allowing one in particular to rule out maximally\psi-epistemic models more efficiently than previously proposed.

How \psi-epistemic models fail at explaining the indistinguishability of quantum states