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Tuesday, January 24, 2012 12:00 pm - 1:00 pm EST (GMT -05:00)

Leonardo Neves: Measurement of spatially encoded photonic qudits

Leonardo Neves

Abstract

In this seminar we will address some measurement strategies for extracting information carried by single photons transmitted through a multi-slit array, the so-called spatial qudits. The focus will be on the methods to implement projective-like measurements and positive operator valued measurements. Applications in quantum state tomography and quantum state discrimination will be discussed.

Tuesday, January 24, 2012 4:00 pm - 5:00 pm EST (GMT -05:00)

Matteo Mariantoni: The Photon Shell Game and the Quantum von Speaker Title Neumann Architecture with Superconducting Circuits

Matteo Mariantoni, University of California, Santa Barbara

Abstract

Superconducting quantum circuits have made significant advances over the past decade, allowing more complex and integrated circuits that perform with good fidelity. We have recently implemented a machine comprising seven quantum channels, with three superconducting resonators, two phase qubits, and two zeroing registers.

Thursday, January 26, 2012 12:00 pm - 1:00 pm EST (GMT -05:00)

Tim Ralph: Time in relativistic quantum information

Tim Ralph, University of Queensland

Abstract

The role of time in relativistic quantum information science is attracting increasing interest. I will discuss two new results: entanglement between the future and the past; and progress towards a consistent quantum field theory for closed timelike curves.

Tuesday, January 31, 2012 4:00 pm - 5:00 pm EST (GMT -05:00)

Rajamani Vijayaraghavan: Tracking the state of a quantum system in real-time: From quantum jumps to feedback

Rajamani Vijayaraghavan, Berkeley

Abstract

How does a quantum system evolve during measurement? The textbook picture of instantaneous, projective measurements only describes the situation before and after, but since any realistic experiment takes a finite amount of time, it is natural to talk about the evolution during the process. Surprisingly, using weak measurements it is possible to completely determine the evolution of the quantum state and look inside the so-called wavefunction collapse.