• Tuesday 17 October 2017

Quantum Nanoelectronics Seminar : Wolfgang Pfaff

14h00 // Room « Remy Lemaire » (K223)

Institut Néel
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 [1]. We further demonstrate that these systems are capable of processing and protecting quantum information encoded in complex multiphoton states stored in the cavity [2].
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 [5]. This enables us to realize quantum state transfer and entanglement between remote cavity nodes [6].
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.

[1] Reagor et al., Phys. Rev. B 94, 014506 (2016)
[2] Ofek et al., Nature 536, 441 (2016)
[3] Kimble, Nature 453, 1023 (2008)
[4] Cirac, Zoller, Kimble, and Mabuchi, Phys. Rev. Lett. 78, 3221 (1998)
[5] Pfaff et al., Nat. Phys. 13, 882 (2017)
[6] Axline, Burkhart, Pfaff, et al., in preparation.

Contact : Wolfgang Pfaff

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