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We propose and analyze a protocol for stabilizing a maximally entangled stateof two noninteracting qubits using active state-dependent feedback from acontinuous two-qubit half-parity measurement in coordination with a concurrent,non-commuting dynamical decoupling drive. We demonstrate that such a drive canbe simultaneous with the measurement and feedback, while also playing a keypart in the feedback protocol itself. We show that robust stabilization withnear-unit fidelity can be achieved even in the presence of realisticnonidealities, such as time delay in the feedback loop, imperfectstate-tracking, inefficient measurements, dephasing from $1/f$-distributedqubit-frequency noise, and relaxation. We mitigate feedback-delay error byintroducing a forward-state-estimation strategy in the feedback controller thattracks the effects of control signals already in transit. More generally, thesteady state is globally attractive without the need for ancillas, regardlessof the error state, in contrast to most known feedback and error correctionschemes.

Stabilizing two-qubit entanglement with dynamically decoupled active feedback