25 avenue des martyrs - Grenoble
Superconducting microwave cavities as memories for modular quantum information processing
Wolfgang Pfaff (Yale University, USA)
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 that are coupled to Josephson qubits as long-lived quantum memories. We show that 3D cavities made from bulk superconductors can be used to store quantum states on millisecond time scales . We further demonstrate that these systems are capable of processing and protecting quantum information encoded in complex multiphoton states stored in the cavity .
An important consideration is how it is possible to scale up to large quantum information processing architectures from individual cavity systems. We aim to realize a modular architecture in which individual network nodes exchange quantum information through propagating photons in transmission lines [3, 4]. We show that we can, rapidly and on-demand, convert multiphoton quantum states from a cavity memory into propagating channels . This enables us to realize quantum state transfer and entanglement between remote cavity nodes .
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 thus provides a route towards a modular quantum computer.
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 Pfaff et al., Nat. Phys. 13, 882 (2017)
 Axline, Burkhart, Pfaff, et al., in preparation.
Contact : Wolfgang Pfaff
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