Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Freyberger, Matthias"'
Autor:
Friedrich, Alexander, Moll, Daniela, Freyberger, Matthias, Plimak, Lev, Schleich, Wolfgang P.
Publikováno v:
Acta Phys. Pol. A 143, S52 (2023)
We show that despite the fundamentally different situations, the wave functional of the vacuum in a resonator is identical to that of free space. The infinite product of Gaussian ground state wave functions defining the wave functional of the vacuum
Externí odkaz:
http://arxiv.org/abs/2306.13147
Publikováno v:
Eur. Phys. J. D 75, 271 (2021)
An early approach to include pointers representing measurement devices into quantum mechanics was given by von Neumann. Based on this idea, we model such pointers by qubits and couple them to a free particle, in analogy to a classical time-of-flight
Externí odkaz:
http://arxiv.org/abs/2110.11085
Autor:
Di Pumpo, Fabio, Freyberger, Matthias
Publikováno v:
Eur. Phys. J. D 73, 163 (2019)
We revisit the pointer-based measurement concept of von Neumann which allows us to model a quantum counterpart of the classical time-of-flight (ToF) momentum. Our approach is based on the Hamiltonian for a particle interacting with two quantum pointe
Externí odkaz:
http://arxiv.org/abs/1909.07724
We investigate how to enhance entanglement in the steady state of interacting two-level systems. The steady state is reached by spontaneous decay of the individual systems. When we additionally couple them to a dissipative two-level ancilla with vari
Externí odkaz:
http://arxiv.org/abs/1510.08247
Entropic uncertainty bound for open pointer-based simultaneous measurements of conjugate observables
Autor:
Heese, Raoul, Freyberger, Matthias
Publikováno v:
J. Phys. A: Math. Theor. 48 (2015) 135304
We discuss the information entropy for a general open pointer-based simultaneous measurement and show how it is bound from below. This entropic uncertainty bound is a direct consequence of the structure of the entropy and can be obtained from the for
Externí odkaz:
http://arxiv.org/abs/1503.01633
Autor:
Heese, Raoul, Freyberger, Matthias
Publikováno v:
Phys. Rev. A 89, 052111 (2014)
We combine traditional pointer-based simultaneous measurements of conjugate observables with the concept of quantum Brownian motion of multipartite systems to phenomenologically model simultaneous measurements of conjugate observables in a thermal en
Externí odkaz:
http://arxiv.org/abs/1405.1255
Autor:
Heese, Raoul, Freyberger, Matthias
Publikováno v:
Phys. Rev. A 87, 012123 (2013)
We present a family of entropic uncertainty relations for pointer-based simultaneous measurements of conjugate observables. The lower bounds of these relations explicitly incorporate the influence of the measurement apparatus. We achieve this by usin
Externí odkaz:
http://arxiv.org/abs/1301.6005
Publikováno v:
Phys. Rev. A 86, 052110 (2012)
A quantum state contains the maximal amount of information available for a given quantum system. In this paper we use weak-value expressions to reconstruct quantum states of continuous-variable systems in the quantum optical domain. The role played b
Externí odkaz:
http://arxiv.org/abs/1211.2185
We present a strategy for estimation of d-level quantum states and for the simple adaption of corresponding measurements. The adaption method is inspired by mutually unbiased measurements, but it is also applicable in cases for which no complete set
Externí odkaz:
http://arxiv.org/abs/1108.2165
Publikováno v:
Phys. Rev. A 78, 064303 (2008)
We analyze quantum state estimation for finite samples based on symmetry information. The used measurement concept compares an unknown qubit to a reference state. We describe explicitly an adaptive strategy, that enhances the estimation fidelity of t
Externí odkaz:
http://arxiv.org/abs/0811.2360