Per Se is a gourmet restaurant located at Columbus Circle in New York, New York. The executive chef and owner is Thomas Keller who is also involved in the restaurants French Laundry in Napa Valley and Bouchon, in Napa Valley and Las Vegas
per se is:

A Latin phrase used in English arguments for "by itself" or "by themselves"
It also is used in law:

Illegal per se, the legal usage of "per se" in criminal and anti-trust law
Negligence per se, legal use in tort law
Other uses:

Per se , a New York City restaurant run by Thomas Keller