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QI: Fachverband Quanteninformation

QI 28: Spin Qubits

QI 28.3: Talk

Thursday, March 9, 2023, 11:45–12:00, F428

Cavity QED with hybrid quantum-dot donor systems — •Jonas Mielke1, Jason R. Petta2, and Guido Burkard11University of Konstanz, Konstanz, Germany — 2University of California, Los Angeles, USA

Nuclear spins show exceptionally long coherence times but the underlying good isolation from their environment is a challenge when it comes to controlling nuclear spin qubits.

A hybrid system in which an electron is shared between a quantum dot (QD) and 31P donor atom implementing a e-spin-nuclear spin flip-flop qubit has been realized. Employing ac-magnetic fields, this system can be harnessed to couple the nuclear spin to microwave cavity photons [1,2]. A related system with an electron confined in a double QD and subject to a B-field gradient constitutes a flopping mode e-spin qubit that couples to cavity photons by electrical means [3,4].

We envision an architecture combining the key ideas of the two aforementioned systems and theoretically investigate the interaction between a nuclear spin with a microwave cavity by electrical means. We demonstrate nuclear spin readout [5] and a cavity mediated nuclear spin √iSWAP-gate with a gate fidelity approaching 95% [6].

[1] Tosi et al., PRB 98, 075131 (2018)

[2] Tosi et al., Nat. Comm. 8, 450 (2017)

[3] Benito et al., PRB 96, 235434 (2017)

[4] Mi et al., Nature 555, 7698 (2018)

[5] Mielke et al., PRX Quantum 2, 020347 (2021)

[6] Mielke et al., arXiv:2209.10026 (2022)

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