Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.

The organizing committee includes Malcolm Boshier (P-21), Diego Dalvit (T-4), Michael Di Rosa (C-PCS), Sebastian Deffner (T-4 & CNLS), Changhyun Ryu (P-21) , Nikolai Sinitsyn (T-4), Rolando Somma (T-4), Christopher Ticknor (T-1), and Wojciech Zurek (T-4).

For more information, or to nominate a speaker, contact Sebastian Deffner.

To add your name to the Quantum Lunch email list, contact Ellie Vigil.

Thursday February 12, 2015
12:30 PM - 2:00 PM

Speaker: Leonid Glazman (Yale University)

Technical Host: Nikolai Sinitsyn

TOPIC: Quantum dynamics of a Fluxonium Device

Abstract
Recent development of a new type of a qubit, fluxonium, facilitated the observation of two elusive quantum effects. The first of the two is the interference between separated in space quantum phase slips. The second one is the produced by quasiparticles dissipative component of the Josephson current. The interference of phase slips manifested itself via inhomogeneous broadening of the qubit oscillations frequency. The dissipative effect of quasiparticles was quantified by measuring the T1 time of the qubit. This latter measurement actually resolved the so-called "cosine-phi" problem which existed since the time the Josephson effect has been predicted. This talk covers the theory of the fluxonium qubit, and its use in designing the experiments and interpreting the data.