# William Daniel Phillips

William Daniel Phillips (born November 5, 1948) is an American physics professor, member of the U.S. National Academy of Sciences, and 1997 Nobel Prize in Physics winner.

## Quotes

* The idea of magnetic trapping is that in a magnetic field, an atom with a magnetic moment will have quantum states whose magnetic or Zeeman energy increases with increasing field and states whose energy decreases, depending on the orientation of the moment compared to the field. The increasing-energy states, or low-field-seekers, can be trapped in a magnetic field configuration having a point where the magnitude of the field is a relative minimum. [No dc field can have a relative maximum in free space (Wing, 1984), so high-field-seekers cannot be trapped.] The requirement for stable trapping, besides the kinetic energy of the atom being low enough, is that the magnetic moment move adiabatically in the field. That is, the orientation of the magnetic moment with respect to the field should not change.
** (1998). "Nobel Lecture: Laser cooling and trapping of neutral atoms". Reviews of Modern Physics 70 (3): 721–741. DOI:10.1103/RevModPhys.70.721. (quote from p. 727; Nobel Lecture delivered in Stockholm on December 8, 1997)
* While in high school, I spent a summer working in a university research lab. The graduate student who mentored me shared this insight: physicists are people who get paid for working at their hobby. For me, that has been a joyous truth. Physicists don’t get paid much, but we sure have a lot of fun. And so, my first wish for you is that, whatever you do, you will work at something you love.
** (2002). "Three Wishes". Juniata Voices 2: 87–90. (Commencement Address, May 9, 1999)
* Wineland and Haroche realized a long-standing dream of quantum physics: studying the behavior of single quantum objects. The founders of quantum mechanics believed that studying a single quantum system, like a single atom or a single photon, was beyond the realm of experimental possibility. Many believed that it did not even make sense to talk about a single atom; only the behavior of an ensemble could be meaningful. In fact, Schrödinger asserted: “…we never experiment with just one electron or atom ... In thought experiments, we sometimes assume that we do; this invariably entails ridiculous consequences…” ... The groups of Haroche and Wineland turned this idea on its head; not only did they use individual atoms and photons to elucidate some of the strangest aspects of quantum mechanics, they have even used them to make practical devices.
** (2013). "Profile of David Wineland and Serge Haroche, 2012 Nobel Laureates in Physics". Proceedings of the National Academy of Sciences 110 (18): 7110–7111. DOI:10.1073/pnas.1221825110.
* I think a lot people had this idea that science advances through eureka moments and it's true to some extent. But my experience has been that it's a lot of really hard work, where finally you have figured out what's going on and you can then move on to the next stage.
** (March 11, 2002)"Time, Einstein, and the Coolest Stuff in the Universe". YouTube. (quote at 1:02:42 of 1:28:55 in video)

## External links

* Encyclopedic article on William Daniel Phillips on Wikipedia
* Media related to William Daniel Phillips on Wikimedia Commons