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Amplification of the quantum superposition macroscopicity of a flux qubit by a magnetized Bose gas
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Volkoff, T. J. | - |
dc.contributor.author | Fischer, Uwe R. | - |
dc.date.accessioned | 2023-04-19T08:58:10Z | - |
dc.date.available | 2023-04-19T08:58:10Z | - |
dc.date.created | 2018-09-07 | - |
dc.date.issued | 2016-10 | - |
dc.identifier.citation | Physical Review A, Vol.94 No.4, p. 042320 | - |
dc.identifier.issn | 2469-9926 | - |
dc.identifier.uri | https://hdl.handle.net/10371/191223 | - |
dc.description.abstract | We calculate a measure of superposition macroscopicity M for a superposition of screening current states in a superconducting flux qubit (SFQ), by relating M to the action of an instanton trajectory connecting the potential wells of the flux qubit. When a magnetized Bose-Einstein condensed (BEC) gas containing N-B similar to O (10(6)) atoms is brought into a O(1) mu m proximity of the flux qubit in an experimentally realistic geometry, we demonstrate the appearance of a twofold to fivefold amplification of M over the bare value without the BEC, by calculating the instanton trajectory action from the microscopically derived effective flux Lagrangian of a hybrid quantum system composed of the flux qubit and a spin-F atomic Bose gas. Exploiting the connection between M and the maximal metrological usefulness of a multimode superposition state, we show that amplification of M in the ground state of the hybrid system is equivalent to a decrease in the quantum Cramer-Rao bound for estimation of an externally applied flux. Our result therefore demonstrates the increased usefulness of the BEC-SFQ hybrid system as a sensor of ultraweak magnetic fields below the standard quantum limit. | - |
dc.language | 영어 | - |
dc.publisher | American Chemical Society | - |
dc.title | Amplification of the quantum superposition macroscopicity of a flux qubit by a magnetized Bose gas | - |
dc.type | Article | - |
dc.identifier.doi | 10.1103/PhysRevA.94.042320 | - |
dc.citation.journaltitle | Physical Review A | - |
dc.identifier.wosid | 000385618500004 | - |
dc.identifier.scopusid | 2-s2.0-84991696767 | - |
dc.citation.number | 4 | - |
dc.citation.startpage | 042320 | - |
dc.citation.volume | 94 | - |
dc.description.isOpenAccess | N | - |
dc.contributor.affiliatedAuthor | Fischer, Uwe R. | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.subject.keywordPlus | SUPERCONDUCTING CIRCUITS | - |
dc.subject.keywordPlus | STATES | - |
dc.subject.keywordPlus | JUNCTION | - |
dc.subject.keywordPlus | SYSTEMS | - |
dc.subject.keywordPlus | LIMITS | - |
dc.subject.keywordPlus | ATOMS | - |
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