Physics – Quantum Physics
Scientific paper
2008-09-09
Physics
Quantum Physics
Scientific paper
10.1103/PhysRevLett.101.240402
The relaxation of a quantum field stored in a high-$Q$ superconducting cavity is monitored by non-resonant Rydberg atoms. The field, subjected to repetitive quantum non-demolition (QND) photon counting, undergoes jumps between photon number states. We select ensembles of field realizations evolving from a given Fock state and reconstruct the subsequent evolution of their photon number distributions. We realize in this way a tomography of the photon number relaxation process yielding all the jump rates between Fock states. The damping rates of the $n$ photon states ($0\leq n \leq 7$) are found to increase linearly with $n$. The results are in excellent agreement with theory including a small thermal contribution.
Bernu Julien
Brune Michel
Deléglise Samuel
Dotsenko Igor
Gleyzes Sébastien
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