Hybrid quantum systems with trapped charged particles

Abstract

We study theoretically the possibilities of coupling the quantum mechanical motion of a trapped charged particle (e.g. ion or electron) to quantum degrees of freedom of superconducting devices, nano-mechanical resonators and quartz bulk acoustic wave resonators. For each case, we estimate the coupling rate between the charged particle and its macroscopic counterpart and compare it to the decoherence rate, i.e. the rate at which quantum superposition decays. A hybrid system can only be considered quantum if the coupling rate significantly exceeds all decoherence rates. Our approach is to examine specific examples, using parameters that are experimentally attainable in the foreseeable future. We conclude that those hybrid quantum system considered involving an atomic ion are unfavorable, compared to using an electron, since the coupling rates between the charged particle and its counterpart are slower than the expected decoherence rates. A system based on trapped electrons, on the other hand, might have coupling rates which significantly exceed decoherence rates. Moreover it might have appealing properties such as fast entangling gates, long coherence and flexible electron interconnectivity topology. Realizing such a system, however, is technologically challenging, since it requires accommodating both trapping technology and superconducting circuitry in a compatible manner. We review some of the challenges involved, such as the required trap parameters, electron sources, electrical circuitry and cooling schemes in order to promote further investigations towards the realization of such a hybrid system.

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• Electronic structure of ultralong-range Rydberg pentaatomic molecules with two polar diatomic molecules
• Temperature coefficients of crystalline-quartz elastic constants over the cryogenic range [4 K, 15 K]
• Probing the acoustic losses of graphene with a low-loss quartz bulk-acoustic-wave resonator at cryogenic temperatures
• Quantum state transfer and input-output theory with time reversal
• Non-equilibrium Coupling of a Quartz Resonator to Ions for Penning-Trap Fast Resonant Detection
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• Strong coherent ion-electron coupling using a wire data bus
• Observation of Low Temperature Magneto-Mechanic Effects in Crystalline Resonant Phonon Cavities
• Quantum Rabi interferometry of motion and radiation
• A Coupled-Oscillators Model to Analyze the Interaction between a Quartz Resonator and Trapped Ions