CQI Seminar: Michel Alexis
by william.schober＠usi.ch
Dear friends,
Next Wednesday at 10 AM in D5.01 we'll have a guest seminar by Michel Alexis from Clemson University, on the use of the nonlinear Fourier transform in quantum signal processing. Title and abstract below.
Hope to see you there,
William Schober
Title: How to "represent" a function in a quantum computer using the nonlinear Fourier transform
Abstract: We define the SU(2)-valued nonlinear Fourier transform and explain its connection with quantum signal processing. In particular, we provide an algorithm to compute the inverse nonlinear Fourier transform in a special case, which allows one to "represent" most functions in a quantum computer. Finally, we mention the higher dimensional analog with the SU(2n)-valued nonlinear Fourier transform. This talk includes joint work with L. Becker, L. Lin, G. Mnatsakanyan, D. Oliveira e Silva, C. Thiele and J. Wang.
1 month, 2 weeks
CQI Seminar: Charles Bedard
by william.schober＠usi.ch
Dear friends,
This afternoon at 3:30 in D5.01, Charles Bedard will give an impromptu seminar on gravitational teleportation. Title and abstract below.
Hope to see you there,
Will Schober
Work in progress with Maria Violaris and Simone Rijavec
Title: Does Gravitational Teleportation Fail?
Abstract: In the famous protocol, the continuous parameters specifying a qubit are transported---or teleported---using shared entanglement and only two bits of classical communication.
This raises the problem of which system, if any, actually carries the dependence on the input state.
Multiple explanations have been offered, and to date, they remain empirically indistinguishable in standard implementations. Here we show that one of them---the Deutsch--Hayden explanation, distinguished by its strictly local and causal flow of information---makes a concrete empirical prediction: teleportation must fail whenever the communication channel is fundamentally classical.
This turns teleportation into a probe for the classicality of candidate communication media, making gravity a decisive test case. We thus propose a new empirical test: does gravitational communication of the two bits support a functioning teleportation protocol?
1 month, 2 weeks