Fig. 1: QT protocol in a TQD.
From: Probabilistic teleportation of a quantum dot spin qubit
a Sequence for the demonstration of QT with markers representing the operation points in the stability diagram in d. The colored rectangular boxes represent individual steps using the pulse shapes shown in Fig. 2 with corresponding colors. b Schematic of our implemantation of the QT protocol. The spin state is teleported from a qubit in QD1 to that in QD3. A spin singlet is prepared in QD3 by adjusting the Fermi level in the reservoir to be between the singlet and triplet levels in QD3. After transfering one of the two electrons in QD3 into QD2, we use Pauli spin blockade (PSB) for the single-shot measurement of the two-spin state in QD1 and QD2 to distinguish whether it is singlet or not. To complete the QT protocol, we post-select the single-shot data conditioned on the singlet outcome. c Annotated scanning electron micrograph of the TQD similar to the one used for the experiment. A QD charge sensor with rf-reflectometry is used to detect the TQD charge states. d Charge stability diagram obtained by sweeping the voltages VPL and VPR on the gate electrodes PL and PR. The symbols represent the bias positions used for various operations in the QT experiment (see Figs. 2 and 3).
