Microwave cavity detected spin blockade in a few electron double quantum dot

Abstract

We investigate spin states of few electrons in a double quantum dot by coupling them weakly to a magnetic field resilient NbTiN microwave resonator. We observe a reduced resonator transmission if resonator photons and spin singlet states interact. This response vanishes in a magnetic field once the quantum dot ground state changes from a spin singlet into a spin triplet state. Based on this observation, we map the two-electron singlet-triplet crossover by resonant spectroscopy. By measuring the resonator only, we observe Pauli spin blockade known from transport experiments at finite source-drain bias and detect an unconventional spin blockade triggered by the absorption of resonator photons.

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• Strong coupling between a microwave photon and a singlet-triplet qubit
• Emergent $\mathcal{P}\mathcal{T}$ symmetry in a double-quantum-dot circuit QED set-up
• Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing
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• Microwave-resonator-detected excited-state spectroscopy of a double quantum dot
• Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• Spin transport through a nanojunction with a precessing anisotropic molecular spin: Quantum interference and spin-transfer torque
• Interplay of Pauli blockade with electron-photon coupling in quantum dots