Daniel Frank Walls

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Daniel Frank Walls (* 1942 in New Zealand ; † May 12, 1999 in Auckland ) was a New Zealand theoretical physicist who dealt with quantum optics .

Walls studied physics at the University of Auckland and received his PhD from Harvard University in 1969 with Roy J. Glauber . As a post-doctoral student he was in Auckland and Stuttgart and from 1972 senior lecturer at the University of Waikato , where he became professor in 1980. From 1987 he was professor of theoretical physics at the University of Auckland. He died of cancer at the age of 57.

He was a leading theorist of non-classical properties of light (quantum optics). With his student Howard Carmichael, he predicted photon antibunching in 1976 and showed the possibility of its generation (independently from Leonard Mandel and others who first observed the effect in 1977) and he was a pioneer in the theory of squeezed light (literally squeezed light ) that is called light in which, for example, only very small amplitude fluctuations occur, but the phase fluctuates strongly (according to the uncertainty relation amplitude-phase) and vice versa.

He also made important contributions to the quantum measurement process, for example experiments of the Schrödinger-Katzen type (superposition of macroscopic wave functions) and quantum nondemolition measurements (QND, non-destructive quantum measurement), originally proposed in the 1970s for gravitational wave experiments (by Braginsky et al.) , transferred from walls and others to quantum optics.

He later worked on Bose-Einstein condensates (BEC), such as the interference of quantized vortices and Josephson-coupled BEC.

In 1981 he became a Fellow of the Royal Society of New Zealand and in 1992 of the Royal Society . In 1990 he received the Einstein Prize for Laser Science and in 1995 the Dirac Medal (IOP) . He was a fellow of the American Physical Society .

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  1. ↑ J. Phys., B, Volume 9, 1976, p. 1199.
  2. ↑ Predicted by Carlton M. Caves in 1981, first observed in 1985. Theoretical work by Walls, for example, Walls Squeezed states of light , Nature, Volume 306, 1983, pp. 141-146, Wolfgang Schleich , Walls, John Archibald Wheeler Area of ​​overlap and interference in phase space versus Wigner pseudoprobabilities , Physical Review A, Volume 38, 1988, pp. 1177-1186.
  3. ↑ B. Yurke, WP Schleich, DF Walls Quantum superpositions generated by quantum nondemolition measurements , Physical Review A, Volume 42, 1990, pp 1703-1711.
  4. ↑ Milburn, Walls Quantum nondemolition measurements via quadratic coupling , Phys. Rev. A, Vol. 28, 1983, pp. 2065-2070.
  5. ↑ Levenson, Shelby, Reid, Walls Quantum nondemolition detection of optical quadrature amplitudes , Phys. Rev. Lett., Vol. 57, 1986, pp. 2473-2476.
  6. ↑ Bachor, Levenson, Walls, Perlmutter, Shelby Quantum non demolition measurements in an optical fiber ring resonator , Phys. Rev. A, Vol. 38, 1988, pp. 180-190.
  7. ↑ Holland, Walls et al. a. Nonideal quantum nondemolition experiments , Phys. Rev. A, Vol. 42, 1990, pp. 2995-2005.
  8. ↑ Gheri, Grangier, Poizat, Walls Quantum non demolition measurements using ghost transitions , Phys. Rev. A, Volume 46, 1992, pp. 4276-4285.
personal data
SURNAME Walls, Daniel Frank
BRIEF DESCRIPTION New Zealand physicist
DATE OF BIRTH 1942
PLACE OF BIRTH New Zealand
DATE OF DEATH May 12, 1999
Place of death Auckland