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

In 1985, Leggett and Garg (1985 Phys. Rev. Lett. 54 857) proposed a Bell-likeinequality to test (in)compatibility between two fundamental concepts ofquantum mechanics. The first concept is 'macroscopic realism', which is thequality of a physical property of a quantum system being independent ofobservation at the macroscopic level. The second concept is 'noninvasivemeasurability', which is the possibility of performing a measurement withoutdisturbing the subsequent evolution of a system. One of the key requirement fortesting the violation of the Leggett-Garg inequality, or Bell's timeinequality, is the ability to perform noninvasive measurements over a qubitstate. In this paper, we present a quantum scattering circuit that implementssuch a measurement for maximally mixed states. The operation of the circuit isdemonstrated using liquid-state nuclear magnetic resonance (NMR) in chloroform,in which the time correlations of a qubit are measured on a probe (ancillary)qubit state. The results clearly show a violation region and are in excellentagreement with the predictions of quantum mechanics.

A scattering quantum circuit for measuring Bell's time inequality: a nuclear magnetic resonance demonstration using maximally mixed states