QUROPE Quantum Information Processing and Communication in Europe

Hybrid Atom-Optomechanics
Physics Viewpoint by A. Schliesser and T. J. Kippenberg

K. Hammerer

"Atomare Dämpfer"

P. Treutlein (P19 UNIBAS/ P11 LMU) talk "Hybrid atom-optomechanics"

In this article we discuss and compare different ways to engineer an interface between ultracold atoms

We measure the frequency dependence of the mechanical quality factor (Q) of SiN membrane oscillators and observe a resonant variation of Q by more than two orders of magnitude. The frequency of the fundamental mechanical mode is tuned reversibly by up to 40% through local heating with a laser. Several distinct resonances in Q are observed that can be explained by coupling to membrane frame modes. Away from the resonances, the background Q is independent of frequency and temperature in the measured range.

We have realized a hybrid optomechanical system by coupling ultracold atoms to a micromechanical membrane.

Mechanical resonators find widespread applications as precision force sensors, the most prominent example being the atomic force microscope (AFM).

We demonstrate a simple technique for microwave field imaging using alkali atoms in a vapor cell.

Long range Rydberg blockade interactions have the potential for efficient implementation of quantum gates between multiple atoms. Here we present and analyze a protocol for implementation of a $k$-atom controlled NOT (C$_k$NOT) neutral atom gate. This gate can be implemented using sequential or simultaneous addressing of the control atoms which requires only $2k+3$ or 5 Rydberg $\pi$ pulses respectively. A detailed error analysis relevant for implementations based on alkali atom Rydberg states is provided which shows that gate errors less than 10% are possible for $k=35$.

We consider