Projective measurements can probe nonclassical work extraction and time correlations

Year: 2024

Authors: Hernbndez-Gumez S., Gherardini S., Belenchia A., Lostaglio M., Levy A., Fabbri N.

Autors Affiliation: Univ Firenze, European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; Consiglio Nazl Ric CNR INO, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; Consiglio Nazl Ric CNR INO, Ist Nazl Ott, Sci Pk, I-34149 Trieste, Italy; Eberhard Karls Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany; Queens Univ Belfast, Ctr Theoret Atom Mol & Opt Phys, Sch Math & Phys, Belfast BT7 1NN, North Ireland; Univ Amsterdam, Korteweg de Vries Inst Math, Amsterdam, Netherlands; Univ Amsterdam, QuSoft, Amsterdam, Netherlands; Bar Ilan Univ, Ctr Quantum Entanglement Sci & Technol, IL-52900 Ramat Gan, Israel; Bar Ilan Univ, Ctr Quantum Entanglement Sci & Technol, IL-52900 Ramat Gan, Israel; MIT, Res Lab Elect, Cambridge, MA 02139 USA.

Abstract: Quantum correlation functions are a natural way to encode multitime information, as they are ubiquitous in analysis from fluctuation theorems to information scrambling. Correlation functions can be identified with quasiprobabilities associated to quantum processes. In this work we show how these can be measured via error-cancellation techniques, using projective measurements only and no ancillae. The scheme is implemented in a nitrogen-vacancy center in diamond undergoing a unitary quantum work protocol. We reconstruct quantummechanical time correlations encoded in the Margenau-Hills quasiprobabilities by observing work extraction peaks five times those of sequential projective energy measurement schemes and in violation of newly derived stochastic bounds. We interpret the phenomenon via anomalous energy exchanges due to the underlying negativity of the quasiprobability distribution.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 6 (2)      Pages from: 23280-1  to: 23280-10

More Information: We gratefully thank F. Poggiali for critical reading of the paper. S.H.G. acknowledges the financial support from CNR-FOE-LENS-2020. S.G. acknowledges The Blanceflor Foundation for financial support through the project The theRmodynamics behInd thE meaSuremenT postulate of quantum mEchanics (TRIESTE) , the Project PRIN 2022 QuReCo, the PNRR MUR projec t PE0000023-NQSTI, and the MISTI Global Seed Funds MIT-FVG Collaboration Grant Revealing and exploiting quantumness via quasiprobabilities: from quantum thermodynamics to quantum sensing. A.B. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project No. BR 5221/4-1, and the EU Horizon Europe EIC Pathfinder project QuCoM (Grant Agreement No. 101046973) . A.L.acknowledges support from the Israel Science Foundation (Grant No. 1364/21) . The work was also supported by the European Commission under Grant No. 101070546- MUQUABIS, and by the European Union’s Next Generation EU Programme through the I-PHOQS Infrastructure and through the Project PRIN 2022 QUASAR.r acknowledges support from the Israel Science Foundation (Grant No. 1364/21) . The work was also supported by the European Commission under Grant No. 101070546- MUQUABIS, and by the European Union’s Next Generation EU Programme through the I-PHOQS Infrastructure and through the Project PRIN 2022 QUASAR.
KeyWords: Spin Coherence Time; Quantum; Statistics; State; Equality
DOI: 10.1103/PhysRevResearch.6.023280

Citations: 3
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