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.
 Reagor et al., Phys. Rev. B 94, 014506 (2016)
 Ofek et al., Nature 536, 441 (2016)
 Kimble, Nature 453, 1023 (2008)
 Cirac, Zoller, Kimble, and Mabuchi, Phys. Rev. Lett. 78, 3221 (1998)
 Pfaff et al., Nat. Phys. 13, 882 (2017)
 Axline, Burkhart, Pfaff, et al., in preparation.
Contact : Wolfgang Pfaff
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