Dr. Daniel Rohrlich





Born: 1954, USA


Academic Qualifications:

  • B.A. 1975, Princeton U., USA
  • M.A. 1981, U.C. Berkeley, USA
  • Ph.D. 1986, S.U.N.Y. Stony Brook, USA

  • A.P.S. Outstanding Referee, 2008
  • Itamar Pitowsky Prize, 2012


Academic Position:

Atom Chip Group and Physics Department
Ben Gurion University of the Negev
Beersheba 84105


Research Interests:

Fundamental aspects and effects of quantum mechanics; quantum measurements; quantum information; cold-atom physics; Bose-Einstein condensates; path integrals; field theory


Research Projects:

Interferometry of clocks; "weak" values in theory and in atomic physics; a new axiomatic basis for quantum mechanics; retrocausality in and beyond quantum mechanics; see also "John Templeton Foundation grant" and "Israel Science Foundation grant" (listed below).



Abstracts of Current Research:

  • D. Rohrlich,  Stronger-than-quantum bipartite correlations violate relativistic causality in the classical limit.  [Submitted to Phys. Rev. Lett.]  Superquantum ("PR-box") correlations, though designed to respect relativistic causality, violate  relativistic causality in the classical limit. Generalizing to all stronger-than-quantum bipartite correlations, I derive Tsirelson's bound from the axioms of nonlocality, relativistic causality and the existence of a classical limit. This derivation of Tsirelson's bound does not assume quantum mechanics yet suggests how Hilbert space is implicit in quantum correlations.  See also PR-box correlations have no classical limit.

  • Y. Aharonov, S. Popescu, D. Rohrlich and P. Skrzypczyk, Quantum Cheshire Cats
    New J. Phys. 15 (2013) 113015.
     In this paper we present a quantum Cheshire Cat.  In a 
    pre- and post-selected experiment we find the Cat in one place, and its grin in another. The Cat is a photon, while the grin is its circular polarization.  See also T. Denkmayr et al., Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment.  Nat. Commun5, 4492 (2014).

  • Y. Aharonov, S. Popescu and D. Rohrlich, On conservation laws in quantum mechanics.   We raise fundamental questions about the very meaning of conservation laws in quantum mechanics and we argue that the standard way of de ning conservation laws, while perfectly valid as far as it goes, misses essential features of nature and has to be revisited and extended.



Some recent publications:


Keywords: quantum effects, nonlocality, quantum information, decoherence, path integrals, clock interferometry



Scientific publications

Lost causes in physics, by R. F. Streater


Quantum Paradoxes

Physical constants and units from N.I.S.T.


Atom Chip Group

Papers of great American physicists


John Templeton Foundation grant

Quantum (Information) Theory meetings


Israel Science Foundation grant




  1. Phone: 08-6479408, 02-5637840, 02-5637173
  2. Fax: 08-6479264







Last updated:  1 August 2016