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Magnetic tuning of the tunnel coupling in an optically active quantum dot molecule
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abstract
Self-assembled optically active quantum dot molecules (QDMs) allow the creation of protected qubits via singlet-triplet spin states. The qubit energy splitting of these states is defined by the tunnel coupling strength and is, therefore, determined by the potential landscape and thus fixed during growth. Applying an in-plane magnetic field increases the confinement of the hybridized wave functions within the quantum dots, leading to a decrease of the tunnel coupling strength. We achieve a tuning of the coupling strength by $(53.4\pm1.7)$ %. The ability to fine-tune this coupling is essential for quantum network and computing applications that require quantum systems with near identical performance.
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Cited by 1 Pith paper
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Resonant and Anti-resonant Exciton-Phonon Coupling in Quantum Dot Molecules
The authors measure voltage-dependent exciton lifetimes in a quantum dot molecule and show that phonon-assisted relaxation resonances and anti-resonances explain the non-monotonic decay rates.
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