Dr. Bruce Yabsley: Quantum entanglement, for fun and profit, at the B-factories

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    Quantum entanglement, for fun and profit, at the B-factories

    Dr. Bruce Yabsley, University of Sidney, Avstralija

The B-factory experiments, Belle and BaBar, have been the leading sources of new results in particle physics over the past decade. Although it is not well-known, their flagship measurements depend critically on quantum entanglement: on the fact that the initial state is a flavor singlet, analogous to the EPR-Bohm state. I will review this beautiful piece of quantum mechanics, and the trouble we went through at Belle when we set out to test, rather than simply use, the entanglement of our B-meson pairs.  I will also discuss the developing synergy between Dalitz analysis at the B-factories (relying on interference in B-decays) and at CLEO-c (relying on their own entangled state) in measuring the unitarity angle phi_3.