@article{discovery1410660,
         journal = {SCIENTIFIC REPORTS},
            year = {2013},
          volume = {3},
           month = {November},
           title = {Magnetically tunable singlet-triplet spin qubit in a four-electron InGaAs coupled quantum dot},
            note = {{\copyright} 2013 Macmillan Publishers Limited. This work is licensed under a Creative Commons Attribution 3.0 Unported license.
To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0

PubMed ID: 24177037},
            issn = {2045-2322},
        keywords = {Qubits; Quantum information},
             url = {http://dx.doi.org/10.1038/srep03121},
        abstract = {A pair of self-assembled InGaAs quantum dots filled with two electrons can act as a singlet-triplet spin qubit
that is robust against nuclear spin fluctuations as well as charge noise. This results in a T2* coherence time
two orders of magnitude longer than that of a single electron, provided the qubit is operated at a particular
''sweet spot'' in gate voltage. However, at this fixed operating point the ground-state splitting can no longer
be tuned into resonance with e.g. another qubit, limiting the options for coupling multiple qubits. Here, we
propose using a four-electron coupled quantum dot to implement a singlet-triplet qubit that features a
magnetically tunable level splitting. As a first step towards full experimental realization of this qubit design,
we use optical spectroscopy to demonstrate the tunability of the four-electron singlet-triplet splitting in a
moderate magnetic field.},
          author = {Weiss, KM and Miguel-Sanchez, J and Elzerman, JM}
}