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Monday, June 11, 2012 12:30 pm - 1:30 pm EDT (GMT -04:00)

Bill Coish: Spin and Orbital Coherence in Quantum Dots for Quantum Information Processing

Abstract

Semiconductor quantum dots provide a versatile and potentially scalable mechanism for manipulating quantum information encoded in discrete orbital and spin degrees of freedom. I will review the state-of-the-art in current developments in this field (leading to fast control on a scale of 200 picoseconds and very long memory times in excess of 200 microseconds).

Thursday, June 21, 2012 3:00 pm - 4:00 pm EDT (GMT -04:00)

Chip Elliott: Quantum Frontiers Distinguished Lecture Series: Can we speak – privately? Quantum cryptography in a broader context

It’s often useful to have a private conversation within a public world. What role can quantum cryptography play in keeping conversations private? Sometimes described as providing “unconditional security guaranteed by the laws of quantum physics,” its security implications are both tantalizing and surprisingly elusive. This talk introduces quantum cryptography and describes the speaker’s experience creating several types of quantum cryptography equipment, within the broader context of mainstream cryptography and secure communications.

Biography

Thursday, June 21, 2012 4:00 pm - 5:00 pm EDT (GMT -04:00)

Stefano Chesi: Spin polarized transmission of holes in quantum point-contacts with strong spin-orbit coupling

Abstract

Evidence is presented for the finite wave vector crossing of the two lowest one-dimensional spin-split subbands in quantum point contacts fabricated from two-dimensional hole gases with strong spin-orbit interaction. This phenomenon offers an elegant explanation for the anomalous sign of the spin polarization filtered by a point contact, as observed in magnetic focusing experiments. Anticrossing is introduced by a magnetic field parallel to the channel or an asymmetric potential transverse to it.