Improving Quantum Measurements by Introducing "Ghost" Pauli Products.
Sign Up to like & getrecommendations! Published in 2022 at "Journal of chemical theory and computation"
DOI: 10.1021/acs.jctc.2c00837
Abstract: Reducing the number of measurements required to estimate the expectation value of an observable is crucial for the variational quantum eigensolver to become competitive with state-of-the-art classical algorithms. To measure complicated observables such as a… read more here.
Keywords: pauli products; ghost pauli; expectation value; quantum ... See more keywords
Determining the quantum expectation value by measuring a single photon
Sign Up to like & getrecommendations! Published in 2017 at "Nature Physics"
DOI: 10.1038/nphys4223
Abstract: A photonic experiment demonstrates protective measurements, a type of weak measurements. These make it possible to determine the expectation value of the polarization of a photon from a single measurement. read more here.
Keywords: photon; expectation value; expectation; quantum expectation ... See more keywords
Weak value beyond conditional expectation value of the pointer readings
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review A"
DOI: 10.1103/physreva.96.032114
Abstract: It is argued that a weak value of an observable is a robust property of a single pre- and postselected quantum system rather than a statistical property. During an infinitesimal time a system with a… read more here.
Keywords: expectation value; weak value; value; pointer ... See more keywords
Vacuum expectation value of twist fields
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.96.066026
Abstract: Twist fields emerge in a number of physical applications ranging from entanglement entropy to scattering amplitudes in four-dimensional gauge theories. In this work, their vacuum expectation values are studied in the path integral framework. By… read more here.
Keywords: value twist; expectation value; vacuum expectation; twist fields ... See more keywords
Full expectation-value statistics for randomly sampled pure states in high-dimensional quantum systems.
Sign Up to like & getrecommendations! Published in 2019 at "Physical review. E"
DOI: 10.1103/physreve.99.012126
Abstract: We explore how the expectation values 〈ψ|A|ψ〉 of a largely arbitrary observable A are distributed when normalized vectors |ψ〉 are randomly sampled from a high-dimensional Hilbert space. Our analytical results predict that the distribution exhibits… read more here.
Keywords: expectation value; expectation; randomly sampled; high dimensional ... See more keywords
Forest Land Expectation Value or Maximum Sustained Yield? Resolving A Long-Standing Paradox
Sign Up to like & getrecommendations! Published in 2023 at "Forests"
DOI: 10.3390/f14051052
Abstract: The Faustmann formula, equivalent to the land expectation value (LEV), yields the present value, starting with bare land, of an infinite series of future timber rotations for a stand. If this formula is used to… read more here.
Keywords: land expectation; land; maximum sustained; value ... See more keywords