Yi, Bin;
Sinha, Urbasi;
Home, Dipankar;
Mazumdar, Anupam;
Bose, Sougato;
(2023)
Massive spatial qubits: Testing macroscopic nonclassicality and Casimir entanglement.
Physical Review Research
, 5
(3)
, Article 033202. 10.1103/physrevresearch.5.033202.
Preview |
Text
Bose_Massive spatial qubits_VoR.pdf - Published Version Download (774kB) | Preview |
Abstract
An open challenge in physics is to expand the frontiers of the validity of quantum mechanics by evidencing nonclassicality of the center of mass state of a macroscopic object. Yet another equally important task is to evidence the essential nonclassicality of the interactions which act between macroscopic objects. Here we introduce a new tool to meet these challenges: massive spatial qubits. In particular, we show that if two distinct localized states of a mass are used as the | 0 ⟩ and | 1 ⟩ states of a qubit, then we can measure this encoded spatial qubit with a high fidelity in the σ x , σ y , and σ z bases simply by measuring its position after different duration of free evolution. This technique can be used reveal the irreducible nonclassicality of the spin and center of mass entangled state of a nanocrystal implying macrocontextuality. Further, in the context of Casimir interaction, this offers a powerful method to create and certify non-Gaussian entanglement between two neutral nano-objects. The entanglement such produced provides an empirical demonstration of the Casimir interaction being inherently quantum.
| Type: | Article |
|---|---|
| Title: | Massive spatial qubits: Testing macroscopic nonclassicality and Casimir entanglement |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/physrevresearch.5.033202 |
| Publisher version: | https://doi.org/10.1103/physrevresearch.5.033202 |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10178074 |
Archive Staff Only
 |
View Item |
