609 citations · 4.2k across the 137 of their papers we have counts for
7 papers · 2 filters
Generation of highly non-classical n-photon polarization states by super-bunching at a photon bottleneck
Holger F. Hofmann
It is shown that coherent superpositions of two oppositely polarized n-photon states can be created by post-selecting the transmission of n independently generated photons into a s…
Distinguishing genuine entangled two-photon-polarization states from independently generated pairs of entangled photons
Kenji Tsujino, Holger F. Hofmann, Shigeki Takeuchi +1
A scheme to distinguish entangled two-photon-polarization states (ETP) from two independent entangled one-photon-polarization states (EOP) is proposed. Using this scheme, the exper…
Quantum-state tomography for spin-l systems
Holger F. Hofmann, Shigeki Takeuchi
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 differen…
Bound entangled states violate a non-symmetric local uncertainty relation
Holger F. Hofmann
As a consequence of having a positive partial transpose, bound entangled states lack many of the properties otherwise associated with entanglement. It is therefore interesting to i…
Characterization of entanglement using sum uncertainty relations for N-level systems
Holger F. Hofmann, Shigeki Takeuchi
The efficient experimental verification of entanglement requires an identification of the essential physical properties that distinguish entangled states from non-entangled states.…
Entanglement and four wave mixing effects in the dissipation free nonlinear interaction of two photons at a single atom
Holger F. Hofmann, Kunihiro Kojima, Shigeki Takeuchi +1
We investigate the nonlinear interaction between two photons in a single input pulse at an atomic two level nonlinearity. A one dimensional model for the propagation of light to an…
Nonlinear interaction of two photons at a one-dimensional atom: spatiotemporal quantum coherence in the emitted field
Kunihiro Kojima, Holger F. Hofmann, Shigeki Takeuchi +1
The nonlinear photon-photon interaction mediated by a single two-level atom is studied theoretically based on a one-dimensional model of the field-atom interaction. This model allo…