Cryogenic platform for coupling color centers in diamond membranes to a fiber-based microcavity
M. Salz, Yanik Herrmann, Athavan Nadarajah, A. Stahl, M. Hettrich, Alastair Stacey, Steven Prawer, David Hunger, F. Schmidt–Kaler
Abstract
Abstract We operate a fiber-based cavity with an inserted diamond membrane containing ensembles of silicon vacancy centers (SiV $${}^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mo>-</mml:mo> </mml:msup> </mml:math> ) at cryogenic temperatures $$\ge 4~$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≥</mml:mo> <mml:mn>4</mml:mn> <mml:mspace/> </mml:mrow> </mml:math> K. The setup, sample fabrication and spectroscopic characterization are described, together with a demonstration of the cavity influence by the Purcell effect. This paves the way towards solid-state qubits coupled to optical interfaces as long-lived quantum memories.