68 citations · 555 across the 20 of their papers we have counts for
20 papers
How two spins can thermalize a third spin
Stephan Kleinbölting, Rochus Klesse
We consider thermalization of a microscopic quantum system by interaction with a thermal bath. Our interest is the minimal size the bath can have while still being able to thermali…
Entanglement of remote quantum systems by environmental modes
Friedemann Queisser, Thomas Zell, Rochus Klesse
We investigate the generation of quantum mechanical entanglement of two remote oscillators that are locally coupled to a common bosonic bath. Starting with a Lagrangian formulation…
Distance dependence of entanglement generation via a bosonic heat bath
Thomas Zell, Friedemann Queisser, Rochus Klesse
Within a generalized Caldeira-Leggett model we analyze the conditions under which a bosonic heat bath can entangle two microscopic quantum systems at a distance . We find that t…
A random-coding based proof for the quantum coding theorem
Rochus Klesse
We present a proof for the quantum channel coding theorem which relies on the fact that a randomly chosen code space typically is highly suitable for quantum error correction. In t…
Decoherence of encoded quantum registers
Stefan Borghoff, Rochus Klesse
In order to eliminate disturbing effects of decoherence, encoding of quantum information in decoherence-free subspaces has been suggested. We analyze the benefits of this concept f…
Approximate quantum error correction, random codes, and quantum channel capacity
Rochus Klesse
We work out a theory of approximate quantum error correction that allows us to derive a general lower bound for the entanglement fidelity of a quantum code. The lower bound is give…