  Stabilizing a nulling interferometer at a nanometric level is the key issue
to obtain deep null depths. The PERSEE breadboard has been designed to study
and optimize the operation of a cophased nulling bench in the most realistic
disturbing environment of a space mission. This presentation focuses on the
current results of the PERSEE bench. In terms of metrology, we cophased at 0.33
nm rms for the piston and 80 mas rms for the tip/tilt (0.14% of the Airy disk).
A Linear Quadratic Gaussian (LQG) control coupled with an unsupervised
vibration identification allows us to maintain that level of correction, even
with characteristic vibrations of nulling interferometry space missions. These
performances, with an accurate design and alignment of the bench, currently
lead to a polychromatic unpolarised null depth of 8.9E-6 stabilized at 3E-7 on
the [1.65-2.45] \mum spectral band (37% bandwidth).
