Zobrazeno 1 - 10
of 250
pro vyhledávání: '"Berthold-Georg Englert"'
Publikováno v:
Symmetry, Vol 13, Iss 9, p 1660 (2021)
Originally conceived as a thought experiment, an apparatus consisting of two Stern–Gerlach apparatuses joined in an inverted manner touched on the fundamental question of the reversibility of evolution in quantum mechanics. Theoretical analysis sho
Externí odkaz:
https://doaj.org/article/eac9c1d9e09848bca787fbcfe7dccd23
Publikováno v:
PRX Quantum, Vol 2, Iss 3, p 030328 (2021)
Characterizingthe noise in the set of gate operations that form the building blocks of a quantum computational device is a necessity for assessing the quality of the device. Here, we introduce randomized linear gate-set tomography, an easy-to-impleme
Externí odkaz:
https://doaj.org/article/f445ab43fc4b44fdb12d14956b6f7f5f
Autor:
Frédéric Bouchard, Khabat Heshami, Duncan England, Robert Fickler, Robert W. Boyd, Berthold-Georg Englert, Luis L. Sánchez-Soto, Ebrahim Karimi
Publikováno v:
Quantum, Vol 2, p 111 (2018)
Quantum key distribution is on the verge of real world applications, where perfectly secure information can be distributed among multiple parties. Several quantum cryptographic protocols have been theoretically proposed and independently realized in
Externí odkaz:
https://doaj.org/article/6831a48c31474859adb1ccf374e1cd15
Publikováno v:
New Journal of Physics, Vol 20, Iss 7, p 073003 (2018)
We improve on the Thomas–Fermi approximation for the single-particle density of fermions by introducing inhomogeneity corrections. Rather than invoking a gradient expansion, we relate the density to the unitary evolution operator for the given effe
Externí odkaz:
https://doaj.org/article/c9ff80fa07484a819409cd57682cf832
Publikováno v:
New Journal of Physics, Vol 17, Iss 4, p 043018 (2015)
High-quality random samples of quantum states are needed for a variety of tasks in quantum information and quantum computation. Searching the high-dimensional quantum state space for a global maximum of an objective function with many local maxima or
Externí odkaz:
https://doaj.org/article/35fba72e9a0d488a8120f66ed21ea465
Publikováno v:
New Journal of Physics, Vol 17, Iss 4, p 043017 (2015)
High-quality random samples of quantum states are needed for a variety of tasks in quantum information and quantum computation. Searching the high-dimensional quantum state space for a global maximum of an objective function with many local maxima or
Externí odkaz:
https://doaj.org/article/72a45d0f9eb34a1686e46d2744a15a55
Publikováno v:
New Journal of Physics, Vol 15, Iss 6, p 063011 (2013)
We report a controllable method for producing mixed two-photon states via spontaneous parametric down-conversion with a two-type-I crystal geometry. By using variable polarization rotators (VPRs), one obtains mixed states of various purities and degr
Externí odkaz:
https://doaj.org/article/0a120cd7404a4c8388fcaa06dd7406e4
Publikováno v:
New Journal of Physics, Vol 15, Iss 12, p 123026 (2013)
An estimator is a state that represents one's best guess of the actual state of the quantum system for the given data. Such estimators are points in the state space. To be statistically meaningful, they have to be endowed with error regions, the gene
Externí odkaz:
https://doaj.org/article/945df9b12de74dafbd49a79f3bb356bd
Publikováno v:
New Journal of Physics, Vol 14, Iss 10, p 105020 (2012)
There exists, in general, a convex set of quantum state estimators that maximize the likelihood for informationally incomplete data. We propose an estimation scheme, catered to measurement data of this kind, to search for the exact maximum-likelihood
Externí odkaz:
https://doaj.org/article/0ac6cb63e9ff4aaf8b5aae5f7dd4b8fd
Quantum theory is one of the most important intellectual developments in the early twentieth century. The confluence of mathematics and quantum physics emerged arguably from Von Neumann's seminal work on the spectral theory of linear operators. This
