HackerPapers

arXiv:quant-ph/0310003quant-ph

Quantum-state tomography for spin-l systems

Holger F. Hofmann, Shigeki Takeuchi

Early discovery. Linked by one identifiable commenter. This paper is outside the main ranking; a mention is not an endorsement.

Abstract

We show that the density matrix of a spin-l system can be described entirely in terms of the measurement statistics of projective spin measurements along a minimum of 4l+1 different spin directions. It is thus possible to represent the complete quantum statistics of any N-level system within the spherically symmetric three dimensional space defined by the spin vector. An explicit method for reconstructing the density matrix of a spin-1 system from the measurement statistics of five non-orthogonal spin directions is presented and the generalization to spin-l systems is discussed.

arXiv comments
10 pages, including 2 tables, minor modifications in section II, final version for publication in Phys. Rev. A
Journal reference
Phys. Rev. A 69, 042108 (2004)
DOI
doi:10.1103/PhysRevA.69.042108
Subjects
quant-phQuantum Physics

On Hacker News

Linked by 1 identifiable commenter in 1 comment across 1 thread, from Dec 2013 to Dec 2013.

Comments linking this paper, per year.

Discussed in comments1 thread

  1. Simulations back up theory that Universe is a hologram 1 comment

    • Thinking about the universe as a massive black hole, whereas black holes are a concept that is still not entirely known makes thinking about this subject highly speculative. This list only adds salt to that wound: http://en.wikipedia.org/wiki/List_of_unsolved_problems_in_ph...…

      X4View on HNParent context

Submitted to Hacker News

Connected through shared HN threads, not inferred similarity or a recommendation.