Reconstructing the Density Operator via Simple Projectors
نویسندگان
چکیده
منابع مشابه
Reconstructing the density operator via simple projectors.
In the realm of quantum theory a state of a physical system is most generally expressed by its density operator ˆ̺. Knowledge of this operator gives complete information of the quantum state. Schemes have been proposed in a number of fields in quantum physics to determine ˆ̺ from measurements either explicitely [1,2,3,4,5,6,7] or indirectly via quasiprobability distributions [8,9,10,11] for mixed...
متن کاملNonequilibrium steady state transport via the reduced density matrix operator.
We present a very simple model for numerically describing the steady state dynamics of a system interacting with continua of states representing a bath. Our model can be applied to equilibrium and nonequilibrium problems. For a one-state system coupled to two free electron reservoirs, our results match the Landauer formula for current traveling through a molecule. More significantly, we can als...
متن کاملThe inverse redshift–space operator: reconstructing cosmological density and velocity fields
We present the linear inverse redshift space operator which maps the galaxy density field derived from redshift surveys from redshift space to real space. Expressions are presented for observers in both the CMBR and Local Group rest frames. We show how these results can be generalised to flux–limited galaxy redshift surveys. These results allow the straightforward reconstruction of real space d...
متن کاملReconstructing Simple Group Actions
Let G be a simple primitive subgroup of Sn, speciied in terms of a set of generating permutations. If jGj n 5 , eecient algorithms are presented that nd \the most natural permutation representation" of G. For example, if G is a classical group then we nd a suitable projective space underlying G. A number of related questions are considered. Our notion of \eeciency" takes into account many exist...
متن کاملComputation of pseudospectra via spectral projectors
In this note, we discuss new techniques for analyzing the pseudospectra of matrices and propose a numerical method for computing the spectral projector associated with a group of eigenvalues enclosed by a polygonal curve. Numerital tests are reported.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1995
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.75.3201