609 citations · 4.2k across the 137 of their papers we have counts for
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Optimal cloning of single photon polarization by coherent feedback of beam splitter losses
Holger F. Hofmann, Toshiki Ide
Light fields can be amplified by measuring the field amplitude reflected at a beam splitter of reflectivity R and adding a coherent amplitude proportional to the measurement result…
Transfer of single photon polarization states by two-channel continuous variable teleportation
Toshiki Ide, Holger F. Hofmann
Superpositions of two orthogonal single-photon polarization states are commonly used as optical qubits. If such qubits are sent by continuous variable quantum teleportation, the mo…
Locally observable conditions for the successful implementation of entangling multi-qubit quantum gates
Holger F. Hofmann, Ryo Okamoto, Shigeki Takeuchi
The information obtained from the operation of a quantum gate on only two complementary sets of input states is sufficient to estimate the quantum process fidelity of the gate. In…
Demonstration of an optical quantum controlled-NOT gate without path interference
Ryo Okamoto, Holger F. Hofmann, Shigeki Takeuchi +1
We report the first experimental demonstration of an optical quantum controlled-NOT gate without any path interference, where the two interacting path interferometers of the origin…
Simulation of interaction Hamiltonians by quantum feedback: a comment on the dynamics of information exchange between coupled systems
Holger F. Hofmann
Since quantum feedback is based on classically accessible measurement results, it can provide fundamental insights into the dynamics of quantum systems by making available classica…