Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/physreva.44.4623 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Conditional Values in Quantum Mechanics.
Entropy (Basel)
September 2024
Hunter College and Graduate Center, City University of New York, New York, NY 10065, USA.
We consider the local value of an operator for a given position or momentum and, more generally on the value of another arbitrary observable. We develop a general approach that is based on breaking up Aψ(x) as Aψ(x)ψ(x)=Aψ(x)ψ(x)R+iAψ(x)ψ(x)I where A is the operator whose local value we seek and ψ(x) is the position wave function. We show that the real part is related to the conditional value for a given position and the imaginary part is related to the standard deviation of the conditional value.
View Article and Find Full Text PDFSnapshotting quantum dynamics at multiple time points.
Nat Commun
October 2024
Beijing Academy of Quantum Information Sciences, Beijing, China.
Measurement-induced state disturbance is a major challenge in obtaining quantum statistics at multiple time points. We propose a method to extract dynamic information from a quantum system at intermediate time points, namely snapshotting quantum dynamics. To this end, we apply classical post-processing after performing the ancilla-assisted measurements to cancel out the impact of the measurements at each time point.
View Article and Find Full Text PDFEnergetics and quantumness of Fano coherence generation.
Sci Rep
August 2024
Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (CNR-INO), Largo Enrico Fermi 6, 50125, Florence, Italy.
In a multi-level quantum system Fano coherences stand for the formation of quantum coherences due to the interaction with the continuum of modes characterizing an incoherent process. In this paper we propose a V-type three-level quantum system on which we certify the presence of genuinely quantum traits underlying the generation of Fano coherences. We do this by determining work conditions that allows for the loss of positivity of the Kirkwood-Dirac quasiprobability distribution of the stochastic energy changes within the discrete system.
View Article and Find Full Text PDFWork fluctuation theorems with initial quantum coherence.
Phys Rev E
June 2024
Dipartimento di Fisica e Astronomia and Sezione INFN, Università di Padova, Via Marzolo 8, 35131 Padova, Italy.
Fluctuation theorems are fundamental results in nonequilibrium thermodynamics beyond the linear response regime. Among these, the paradigmatic Tasaki-Crooks fluctuation theorem relates the statistics of the works done in a forward out-of-equilibrium quantum process and in a corresponding backward one. In particular, the initial states of the two processes are thermal states and thus incoherent in the energy basis.
View Article and Find Full Text PDFOptimal work extraction from quantum batteries based on the expected utility hypothesis.
Phys Rev E
April 2024
Dipartimento di Fisica e Astronomia e Sezione INFN, Università di Padova, 35131 Padova, Italy.
Work extraction in quantum finite systems is an important issue in quantum thermodynamics. The optimal work extracted is called ergotropy, and it is achieved by maximizing the average work extracted over all the unitary cycles. However, an agent that is non-neutral to risk is affected by fluctuations and should extract work by following the expected utility hypothesis.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!