Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 105: Focus Session: Mesoscopic Superconductivity and Quantum Circuits

TT 105.5: Invited Talk

Friday, March 16, 2018, 11:45–12:15, H 0104

On-demand distribution of quantum information between superconducting cavity quantum memories — •Wolfgang Pfaff — Department of Applied Physics, Yale University, USA — Microsoft Station Q, TU Delft, Netherlands

Superconducting cavities can store microwave fields for several milliseconds, naturally making them a promising system for realizing memories for superconducting circuits. In this talk, I will present our approach for using cavities for modular, distributed quantum computing.

Microwave cavities coupled to Josephson qubits can serve as long-lived quantum memories. In particular, 3D cavities made from bulk superconductors can store quantum states on millisecond time scales. Further, these systems are capable of processing and protecting quantum information encoded in complex multiphoton states stored in the cavity.

It is an ongoing challenge to scale up to large quantum computing architectures from individual cavity systems. We aim to realize a modular architecture in which individual nodes exchange quantum information through propagating photons in transmission lines. We show that we can, rapidly and on-demand, convert quantum states from a cavity memory into propagating channels. This enables us to realize deterministic quantum state transfer and entanglement between remote cavities. Our cavity system can thus serve as the backbone in a microwave quantum network. It can be used to realize error-protected distribution of quantum information and provides a route towards a modular quantum computer.