Low-noise conditional operation of singlet-triplet coupled quantum dot qubits

Details Low-noise conditional operation of singlet-triplet coupled quantum dot qubits Low-noise conditional operation of singlet-triplet coupled quantum dot qubits

2011-07-19

arxiv.org/abs/1107.3827v2

Phys. Rev. B 84, 121306(R) (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.121306

We theoretically study the influence of charge noise on a controlled phase gate, implemented using two proximal double quantum dots coupled electrostatically. Using the configuration interaction method, we present a full description of the conditional control scheme and quantitatively calculate the gate error arising from charge fluctuations. Our key finding is that the existence of noise-immune sweet spots depends on not only the energy detuning but also the device geometry. The conditions for sweet spots with minimal charge noise are predicted analytically and verified numerically. Going beyond the simple sweet-spot concept we demonstrate the existence of other optimal situations for fast and low-noise singlet-triplet two-qubit gates.

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