609 citations · 4.2k across the 137 of their papers we have counts for
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Violation of local uncertainty relations as a signature of entanglement
Holger F. Hofmann, Shigeki Takeuchi
Entangled states represent correlations between two separate systems that are too precise to be represented by products of local quantum states. We show that this limit of precisio…
Realization of a resonant non-linear phase flip in cavity quantum electrodynamics
Holger F. Hofmann, Kunihiro Kojima, Shigeki Takeuchi +1
Optical nonlinearities sensitive to individual photons may be extremely useful as elements in quantum logic circuits for photonic qubits. A much cited example is the work of Turche…
Uncertainty characteristics of generalized quantum measurements
Holger F. Hofmann
The effects of any quantum measurement can be described by a collection of measurement operators {M_m} acting on the quantum state of the measured system. However, the Hilbert spac…
Optimized phase switching using a single atom nonlinearity
Holger F. Hofmann, Kunihiro Kojima, Shigeki Takeuchi +1
We show that a nonlinear phase shift of pi can be obtained by using a single two level atom in a one sided cavity with negligible losses. This result implies that the use of a one…
Realization of quantum operations on photonic qubits by linear optics and post-selection
Holger F. Hofmann, Shigeki Takeuchi
One of the greatest difficulties in the applications of single photon polarization states as qubits is the realization of controlled interactions between two photons. Recently, it…
Causality in quantum teleportation: information extraction and noise effects in entanglement distribution
Holger F. Hofmann
Quantum teleportation is possible because entanglement allows a definition of precise correlations between the non-commuting properties of a local system and corresponding non-comm…