Research paperTheoreticalLimitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dotsIgor Bragar, Lukasz CywińskiarXiv·2023·10.48550/ARXIV.2208.14150·arXiv:2312.16583AbstractWe analyze a procedure for entangling two singlet-triplet (S-T₀) qubits operated in a regime where the magnetic-field-gradient energy is much smaller than the exchange energy. Using analytical expressions for single-qubit free-induction-decay and spin-echo dynamics under quasistatic and 1/f^β charge-noise fluctuations, we examine how decoherence limits the efficiency of a capacitive Ising-type two-qubit entangling protocol. The results indicate that spin echo suppresses most nuclear-polarization noise and that the observed decoherence is consistent with uncorrelated 1/f^β charge noise acting on the two qubits.Read more
Research paperTheoreticalLimitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dotsIgor Bragar, Lukasz CywińskiarXiv·2023·10.48550/ARXIV.2208.14150·arXiv:2312.16583AbstractWe analyze a procedure for entangling two singlet-triplet (S-T₀) qubits operated in a regime where the magnetic-field-gradient energy is much smaller than the exchange energy. Using analytical expressions for single-qubit free-induction-decay and spin-echo dynamics under quasistatic and 1/f^β charge-noise fluctuations, we examine how decoherence limits the efficiency of a capacitive Ising-type two-qubit entangling protocol. The results indicate that spin echo suppresses most nuclear-polarization noise and that the observed decoherence is consistent with uncorrelated 1/f^β charge noise acting on the two qubits.Read more
Research paperTheoreticalLimitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dotsIgor Bragar, Lukasz CywińskiarXiv·2023·10.48550/ARXIV.2208.14150·arXiv:2312.16583AbstractWe analyze a procedure for entangling two singlet-triplet (S-T₀) qubits operated in a regime where the magnetic-field-gradient energy is much smaller than the exchange energy. Using analytical expressions for single-qubit free-induction-decay and spin-echo dynamics under quasistatic and 1/f^β charge-noise fluctuations, we examine how decoherence limits the efficiency of a capacitive Ising-type two-qubit entangling protocol. The results indicate that spin echo suppresses most nuclear-polarization noise and that the observed decoherence is consistent with uncorrelated 1/f^β charge noise acting on the two qubits.Read more
Research paperTheoreticalLimitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dotsIgor Bragar, Lukasz CywińskiarXiv·2023·10.48550/ARXIV.2208.14150·arXiv:2312.16583AbstractWe analyze a procedure for entangling two singlet-triplet (S-T₀) qubits operated in a regime where the magnetic-field-gradient energy is much smaller than the exchange energy. Using analytical expressions for single-qubit free-induction-decay and spin-echo dynamics under quasistatic and 1/f^β charge-noise fluctuations, we examine how decoherence limits the efficiency of a capacitive Ising-type two-qubit entangling protocol. The results indicate that spin echo suppresses most nuclear-polarization noise and that the observed decoherence is consistent with uncorrelated 1/f^β charge noise acting on the two qubits.Read more
