Quantum Optics Seminar: Kai-Niklas Schymik

Long Quantum Memory and High-Fidelity Gates for Spin Qubits in isotopically engineered Diamond

A key question for quantum computing, simulation and communication is: How can we scale up the quantum system while protecting it from decoherence? Quantum networks offer a promising approach that avoids a single large structure of ever increasing complexity. Such networks connect multiple copies of independent nodes, each containing a number of qubits for storing and processing quantum states, through photonic links. Even in the presence of noisy interlinks, quantum networks could become feasible when nodes repeatedly communicate with each other to purify imperfections. This however requires high-fidelity control of qubits in a single node together with low dephasing of memory qubits during entanglement distribution over the network. In this talk, I will show how our group at QuTech tries to tackle this problem. I will especially focus on how isotopically engineered diamond can offer long-lived nuclear spin qubits that are robust to the optical link operation of the NV center.

Kai-Niklas Schymik obtained his PhD at Universite Paris-Saclay in 2022 for work on a quantum simulation platform with Rydberg atoms in optical tweezer arrays. Since May 2022, he is a postdoc in Tim Taminiau's group at Qutech in Delft, working on quantum networks with NV centers.