[quantum-info] Today's PIQuDos
Markus Mueller
mmueller at perimeterinstitute.ca
Mon Jan 21 11:09:08 EST 2013
Hi all,
this is a reminder of Christian Schilling's talk today at 4 pm in the
Time Room.
Title: *Pinning of Fermionic Occupation Numbers*
Speaker: *Christian Schilling* (ETH Zurich)
Abstract:
The problem of determining and describing the family of 1-particle
reduced density operators (1-RDO) arising from N-fermion pure states
(via partial trace) is known as the fermionic quantum marginal problem.
We present its solution, a multitude of constraints on the eigenvalues
of the 1-RDO, generalizing the Pauli exclusion principle. To explore the
relevance of these constraints we study an analytically solvable model
of N fermions in a harmonic potential and determine the spectral
`trajectory' corresponding to the ground state as function of the
fermion-fermion interaction strength. Intriguingly, we find that the
occupation numbers are almost, but not exactly, pinned to the boundary
of the allowed region (quasi-pinned). Our findings suggest a
generalization of the Hartree-Fock approximation.
Date: Monday, Jan 21, 2013 - 4:00 pm
Location: Time Room (294)
Best,
Markus
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