Nonlocal variables with product-state eigenstates
نویسندگان
چکیده
An alternative proof for existence of ‘quantum nonlocality without entanglement’, i.e. existence of variables with product-state eigenstates which cannot be measured locally, is presented. A simple ‘nonlocal’ variable for the case of one-way communication is given and the limit for its approximate measurability is found. PACS numbers: 03.65.Ud, 03.65.Ta, 03.67.−a
منابع مشابه
Nonlocal variables with product states eigenstates
An alternative proof for existence of " quantum nonlocality without entanglement " , i.e. existence of variables with product-state eigenstates which cannot be measured locally, is presented. A simple " nonlocal " variable for the case of one-way communication is given and the limit for its approximate measurability is found.
متن کاملInstantaneous measurement of nonlocal variables.
It is shown, under the assumption of the possibility to perform an arbitrary local operation, that all nonlocal variables related to two or more separate sites can be measured instantaneously, except for a finite time required for bringing to one location the classical records from these sites which yield the result of the measurement. It is a verification measurement: it yields reliably the ei...
متن کاملGeneralizing the Kodama State I: Construction
The Kodama State is unique in being an exact solution to all the ordinary constraints of canonical quantum gravity that also has a well defined semi-classical interpretation as a quantum version of a classical spacetime, namely (anti)de Sitter space. However, the state is riddled with difficulties which can be tracked down to the complexification of the phase space necessary in its construction...
متن کاملFinding Matrix Product State Representations of Highly Excited Eigenstates of Many-Body Localized Hamiltonians.
A key property of many-body localized Hamiltonians is the area law entanglement of even highly excited eigenstates. Matrix product states (MPS) can be used to efficiently represent low entanglement (area law) wave functions in one dimension. An important application of MPS is the widely used density matrix renormalization group (DMRG) algorithm for finding ground states of one-dimensional Hamil...
متن کاملar X iv : h ep - l at / 0 50 91 02 v 1 2 3 Se p 20 05 The Quark Structure of Pentaquarks
Motivated by the possible observation of the Θ+(1530), we study the quark structure of pentaquark states in quenched lattice QCD. The complete set of 19 local sources that have the proper symmetry for positive or negative parity isoscalar pentaquarks is constructed, as well as a nonlocal source composed of two displaced “good” diquarks. Quantitative structure information is determined from diag...
متن کامل