Dan Walls | |
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.jpg) Dan Walls | |
| Born | Daniel Frank Walls (1942-09-13)13 September 1942 Napier, New Zealand |
| Died | 12 May 1999(1999-05-12) (aged 56) Auckland, New Zealand |
| Alma mater |
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| Known for | Quantum optics Squeezed coherent states |
| Awards |
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| Scientific career | |
| Fields | Theoretical physics Quantum optics |
| Institutions | |
| Thesis | Topics in Non-Linear Quantum Optics (1969) |
| Doctoral advisor | Roy J. Glauber |
| Doctoral students | |
| Website | www |
Daniel Frank WallsFRS (13 September 1942 – 12 May 1999) was a New Zealand theoretical physicist specialising inquantum optics.[1]
Walls gained a BSc in physics and mathematics and a first class honours MSc in physics at theUniversity of Auckland. He then went toHarvard University as aFulbright Scholar, obtaining his PhD in 1969. He was supervised byRoy J. Glauber who was later awarded a Nobel prize in 2005.[1]
After holdingpostdoctoral research positions in Auckland and Stuttgart, Walls became a senior lecturer in physics at theUniversity of Waikato in 1972, where he became professor in 1980. Together with his colleagueCrispin Gardiner, during the next 25 years he established a major research centre for theoretical quantum optics in New Zealand and built active and productive collaborations with groups throughout the world.[1]
In 1987 he moved to the University of Auckland as professor of theoretical physics.
His major research interests centred on the interaction and similarities between light and atoms. He was notable for his wide-ranging expertise in relating theory to experiment, and was involved in all major efforts to understand non-classical light. A seminal paper[2] by Walls with his first graduate student Howard Carmichael, showed how to createantibunched light, in whichphotons arrive at regular intervals, rather than randomly.
Walls was a pioneer in the study of ways that the particle-like nature of light (photons) could be controlled to make optical systems less susceptible to unwanted fluctuations, in particular by the use ofsqueezed light, a concept formulated byCarlton Caves. In squeezed light, some fluctuations can be made very small provided other fluctuations are correspondingly large.
He made major contributions to the theory of quantum measurement such as those involvingAlbert Einstein's"which-path" experiment, and thequantum nondemolition measurement. Walls also used a simple field theoretical approach to explain and corroborateDirac's description of photon interference and in particular Dirac's statement "that a photon interferes only with itself."[3]
In the later stages of his career he focused his research efforts on the theoretical aspects of the newly created state of matter, theBose–Einstein condensate (BECs). Some of his contributions in the field include the prediction of the interference signature of quantized vortices, and the collapses and revivals of the Josephson coupled BECs.
Walls was elected aFellow of the Royal Society (FRS) in 1992. Walls was also elected Fellow of theAmerican Physical Society (1981)[4] and theRoyal Society of New Zealand (FRSNZ). In 1995 he was awarded theDirac Medal by theInstitute of Physics for theoretical physics.[1]
TheDodd-Walls Centre for Photonic and Quantum Technologies, a New Zealand Centre of Research excellence based in theUniversity of Otago, was named[5] afterJack Dodd and Dan Walls in recognition of their pioneering roles in establishing New Zealand's as an internationally recognised standing in photonics, quantum optics and ultra-cold atoms.
Dan Walls had two younger siblings, a sister and a brother. He married Fari Khoy in 1968 with whom he had one son, Mark, in 1980. This marriage ended in 1986. His partner in later years was Pamela King.[6] Walls died of cancer at hospital, in Auckland, aged 57.[7]
In 2008 the New Zealand Institute of Physics named a biennial award in honour of Walls. The Dan Walls Medal is awarded to "the physicist working in New Zealand who is deemed to have made the greatest impact nationally and/or internationally in their field through predominantly New Zealand-based research".[8] Winners have includedPaul Callaghan,David Parry,Jeff Tallon,Matt Visser,Howard Carmichael,Peter Schwerdtfeger, andJenni Adams.[9]
