Abstracts

Decoherence-free quantum computing in Kondo-coupled optical tweezers

Presenting Author: Leonid Isaev, JILA, NIST, CU Boulder
Contributing Author(s): Y. Lin, B. J. Lester, C. A. Regal, and A. M. Rey

We propose a basis for decoherence-free quantum computing that uses neutral atoms and encodes qubits in the collective atomic spin and motional degrees of freedom. The physical qubit consists of three spin-\(\frac{1}{2}\) atoms in a double-well, two localized in the lowest vibrational mode and one atom in an excited delocalized state, subject to a staggered Zeeman field whose direction is opposite in the two traps. An interplay between this field gradient and exchange interactions gives rise to a local singlet-triplet degeneracy, and defines a logical qubit subspace. For strong interactions this subspace enjoys full protection against longitudinal magnetic-field noise, and is protected by an energy gap against transverse spin-flipping perturbations. Arbitrary single-qubit rotations are performed by virtue of resonant transfer of two-atom singlet-triplet states between the wells. Moreover, a two-qubit entangling control-z gate can be implemented. We design a qubit initialization protocol that employs Landau-Zener adiabatic tunneling to efficiently create a spin-singlet state in one well, and argue that our proposal can be realized using optical tweezers to create the double-well, hyperfine states of bosonic \(^{87} {\rm Rb}\) atoms to implement spin degrees of freedom, and laser-induced AC Stark shifts to impose the Zeeman field gradient.

(Session 8 : Friday from 2:15pm - 2:45pm)

 

SQuInT Chief Organizer
Akimasa Miyake, Assistant Professor
amiyake@unm.edu

SQuInT Co-Organizer
Mark M. Wilde, Assistant Professor LSU
mwilde@phys.lsu.edu

SQuInT Administrator
Gloria Cordova
gjcordo1@unm.edu
505 277-1850

SQuInT Event Coordinator
Karen Jones, LSU
kjones@cct.lsu.edu

SQuInT Founder
Ivan Deutsch, Regents' Professor
ideutsch@unm.edu

Tweet About SQuInT 2017!