Hello all,
In my previous email, I had misstated the affiliation of the speaker. His main affiliation is Chennai Mathematical Institute, Siruseri. The corrected information is below.
The time (3 pm) and the place (H320) remain unchanged.
Best,
Dan
Speaker: N.D. Hari Dass Affiliations: Centre for Quantum Information and Quantum Computation, Indian Institute of Science, Bangalore; and Chennai Mathematical Institute, Siruseri
Title: Varieties of Quantum Measurements
Abstract: The first explicit model for quantum measurements was given by von Neumann, strongly influenced by Dirac, for the type of measurements that have come to be known as Projective measurements. In these, the outcomes are always eigenvalues and the post-measurement state is the corresponding eigenstate. This has led to a widespread ’belief’ that quantum measurements always ’irretrievably disturb’ the state of the system. But a number of very interesting measurement schemes have emerged since the von Neumann model, and I shall present these varieties of quantum measurements and critically assess them. That will include i) the Arthurs-Kelly type simultaneous measurements of canonically conjugate observables, ii) the Protective measurements of Aharonov and Vaidman that directly measure expectation values, iii) the weak measurements that do not change the system appreciably at all, and finally iv) the weak value measurements that enable direct measurement of ’normalized’ matrix elements of observables between chosen states. The last kinds are also due to Aharonov and Vaidman.