Coherence limitations in the optical control of the singlet-triplet
qubit in a quantum dot molecule
- URL: http://arxiv.org/abs/2202.13944v1
- Date: Mon, 28 Feb 2022 16:49:18 GMT
- Title: Coherence limitations in the optical control of the singlet-triplet
qubit in a quantum dot molecule
- Authors: Karol Kawa and Tilmann Kuhn and Pawe{\l} Machnikowski
- Abstract summary: We analyze the dynamics of a qubit implemented on a singlet-triplet subspace of two-electron states in a self-assembled quantum dot molecule.
We quantitatively characterize the imperfections of the qubit operation resulting from non-adiabatic evolution and from limited spectral selectivity in a real system.
We are able to identify the optimization trade-offs between different sources of errors and indicate the most favorable conditions for quantum control of the singlet-triplet qubit in the two optical control schemes.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We analyze the optically driven dynamics of a qubit implemented on a
singlet-triplet subspace of two-electron states in a self-assembled quantum dot
molecule. We study two possible control schemes based on the coupling to an
excited (four-particle) state either by two spectrally separated laser pulses
or by a single spectrally broad pulse. We quantitatively characterize the
imperfections of the qubit operation resulting from non-adiabatic evolution and
from limited spectral selectivity in a real system, as compared to the ideal
adiabatic Raman transfer of occupation in the $\Lambda$-system. Next, we study
the effects of decoherence induced by the coupling to the phonons of the
surrounding crystal lattice and by radiative recombination. As a result, we are
able to identify the optimization trade-offs between different sources of
errors and indicate the most favorable conditions for quantum control of the
singlet-triplet qubit in the two optical control schemes.
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