traceOut

trace out a subsystem

Contents

Syntax

Description

traceOut(name) traces out the subsystem name. The resulting reduced density matrices are safed in the variable reduced_rho_hist. Further operations can be performed on these matrices manually and the getConcurrence method relies on them. Mathematically the reduced density matrix is generated by

$$ \rho_r =  \sum_i <n_i |\rho| n_i> $$

where n_i are the kronecker expanded basis vectors of subsystem name.