SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Quantum Computing (joint session TT/DY)

TT 13.2: Talk

Wednesday, September 29, 2021, 11:30–11:45, H7

Cavity mediated quantum gate between distant charge qubits — •Florian Kayatz, Jonas Mielke, and Guido Burkard — Department of Phyiscs, University of Konstanz, Konstanz, Germany

Gate based quantum computers require high fidelity single-qubit and two-qubit gates to allow for arbitrary multi-qubit operations that are needed to perform a quantum algorithm. Ideally, one has "all-to-all" connectivity, i.e. an architecture with two-qubit gates between any desired pair of qubits. Notably, short-ranged interactions such as capacitive coupling and the exchange interaction cannot be harnessed to implement two-qubit gates between distant qubits. We investigate whether a high-fidelity iSWAP gate between distant charge qubits can be implemented by using a microwave resonator as an intermediate system mediating the interaction. In particular, we consider charge qubits formed by a single electron confined in a Si double quantum dot that are coupled to a microwave resonator via electric dipole coupling. We theoretically demonstrate that, in the dispersive regime, the photons can mediate an iSWAP gate. We then calculate the gate fidelity in the presence of the dominant noise sources, quasi-static charge noise, resonator damping and phonon induced charge relaxation, and find a very limited gate fidelity.