Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 57: Quantum Information (Quantum Repeater)
Q 57.4: Talk
Friday, March 13, 2020, 12:00–12:15, e001
A passive, heralded quantum memory with crossed optical fiber cavities — •Dominik Niemietz1, Manuel Brekenfeld1, Joseph D. Christesen1,2, and Gerhard Rempe1 — 1MPQ, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 2NIST, Boulder, Colorado 80305, USA
The impossibility to clone quantum information renders quantum communication secure, but also prevents quantum information from being amplified, causing processes that are subject to losses become probabilistic. In many cases, finite success probabilities can be coped with a herald [1] that indicates the successful completion of a process without touching the underlying quantum information. This applies, in particular, to the propagation of photons in quantum networks [2] where photon loss in optical fibers can be remedied using quantum repeaters [1]. In this talk, we present a promising candidate for a node in such a network: A heralded quantum memory for photonic polarization qubits based on single rubidium atoms trapped at the crossing point of two optical fiber cavities, one for the qubit, the other for the herald. Our high-fidelity quantum memory features fully passive storage, requiring neither amplitude- and phase-critical control fields nor error-prone feedback loops. With these properties, our system can be an important contribution to the current quest for a quantum repeater and for the realization of hybrid quantum systems.
[1] Briegel, Dür, Cirac and Zoller, Phys. Rev. Lett. 81, 5932-5935 (1998)
[2] Ritter et al., Nature 453, 1023-1030 (2012)