Decoherence of two coupled singlet-triplet spin qubits

Abstract

We study a pair of capacitively coupled singlet-triplet spin qubits. We characterize the two-qubit decoherence through two complementary measures, the decay time of coupled-qubit oscillations and the fidelity of entangled state preparation. We provide a quantitative map of their dependence on charge noise and field noise, and we highlight the magnetic field gradient across each singlet-triplet qubit as an effective tool to suppress decoherence due to charge noise.

arXiv comment8 pages, 7 figures; published version

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Cited by in corpus (7)

• Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
• Spin-Weyl quantum unit: theoretical proposal
• Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
• Coherence time analysis in semiconducting hybrid qubit under realistic experimental conditions
• Exact analytical treatment of multiqubit noisy dynamics in exchange-coupled semiconductor spin qubits
• Semiconducting double-dot exchange-only qubit dynamics in presence of magnetic and charge noises
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots