Speaker: John Nichol (Rochester)
Title: Why do spin qubits dephase?
Abstract: Isolated spins in semiconductorscan retain their quantum phase coherence for times exceeding one second. Suchlong coherence times make spin qubits a versatile platform for exploringquantum information processing and condensed matter physics. However, mostschemes to entangle spin qubits involve endowing the spin with an electricdipole moment, rendering its energy splitting sensitive to charge noise in thesemiconductor. I will give an overview of charge noise in semiconductor spinqubits, including what we know and do not know about it, and I will discuss anew strategy to entangle spin qubits using large magnetic field gradients tosuppress the effects of charge noise. Using this technique, we demonstrate anentangling gate between spin qubits with a fidelity of 90%.
Host: Robert Throckmortonhttp://www.physics.umd.edu/cmtc/seminars.html
When: Fri, Feb. 16 @ 11:15am
Where: CMTC Conference Room (2205 Toll Physics Bldg.)