Decoherence-free spin entanglement generation and purification in nanowire double quantum dots

Abdel‐Baset A. Mohamed, Heba Allhibi, Fahad Aljuaydi

L. A. Castro-Enríquez, M. Cambiaso, A. Martín-Ruiz

Xuedong Hu, S. Das Sarma

Peng Xue

We propose a deterministic generation and purification of decoherence-free spin entangled states with singlet-triplet spins in nanowire double quantum dots via resonator-assisted charge manipulation and measurement techniques. Each spin qubit corresponds to two electrons in a double quantum dot in the nanowire, with the singlet and one of the triplets as the decoherence-free qubit states. The logical qubits are immunized against the dominant source of decoherence-dephasing—while the influences of additional errors are shown by numerical simulations. We analyse the performance and stability of all required operations and emphasize that all techniques are feasible in current experimental conditions.

Jacob M. Taylor, Wolfgang Dür, P. Zoller +3 more

We show how realistic charge manipulation and measurement techniques, combined with the exchange interaction, allow for the robust generation and purification of four-particle spin entangled states in electrically controlled semiconductor quantum dots. The generated states are immunized to the dominant sources of noise via a dynamical decoherence-free subspace; all additional errors are corrected by a purification protocol. This approach may find application in quantum computation, communication, and metrology.

Rodriguez-Moreno, A. D. Hernández de la Luz, Lilia Meza-Montes