Towards hybrid circuit quantum electrodynamics with quantum dots
Publication date: Available online 5 August 2016 Source:Comptes Rendus Physique Author(s): Jérémie J. Viennot, Matthieu R. Delbecq, Laure E. Bruhat, Matthieu C. Dartiailh, Matthieu M. Desjardins, Matthieu Baillergeau, Audrey Cottet, Takis Kontos Cavity quantum electrodynamics allows one to study the interaction between light and matter at the most elementary level. The methods developed in this field have taught us how to probe and manipulate individual quantum systems like atoms and superconducting quantum bits with an exquisite accuracy. There is now a strong effort to extend further these methods to other qu...
Source: Comptes Rendus Physique - August 4, 2016 Category: Physics Source Type: research
Detecting itinerant single microwave photons
Publication date: Available online 3 August 2016 Source:Comptes Rendus Physique Author(s): Sankar Raman Sathyamoorthy, Thomas M. Stace, Göran Johansson Single-photon detectors are fundamental tools of investigation in quantum optics and play a central role in measurement theory and quantum informatics. Photodetectors based on different technologies exist at optical frequencies and much effort is currently being spent on pushing their efficiencies to meet the demands coming from the quantum computing and quantum communication proposals. In the microwave regime, however, a single-photon detector has remained elusive, a...
Source: Comptes Rendus Physique - August 3, 2016 Category: Physics Source Type: research
Towards a spin-ensemble quantum memory for superconducting qubits
This article reviews efforts to build a new type of quantum device, which combines an ensemble of electronic spins with long coherence times, and a small-scale superconducting quantum processor. The goal is to store over long times arbitrary qubit states in orthogonal collective modes of the spin-ensemble, and to retrieve them on-demand. We first present the protocol devised for such a multi-mode quantum memory. We then describe a series of experimental results using NV (as in nitrogen vacancy) center spins in diamond, which demonstrate its main building blocks: the transfer of arbitrary quantum states from a qubit into th...
Source: Comptes Rendus Physique - July 27, 2016 Category: Physics Source Type: research
Chirality in photonic systems
Publication date: Available online 27 July 2016 Source:Comptes Rendus Physique Author(s): Dmitry Solnyshkov, Guillaume Malpuech The optical modes of photonic structures are the so-called TE and TM modes that bring intrinsic spin–orbit coupling and chirality to these systems. This, combined with the unique flexibility of design of the photonic potential, and the possibility to mix photon states with excitonic resonances, sensitive to magnetic field and interactions, allows us to achieve many phenomena, often analogous to other solid-state systems. In this contribution, we review in a qualitative and comprehensive ...
Source: Comptes Rendus Physique - July 27, 2016 Category: Physics Source Type: research
Quantum magnonics: The magnon meets the superconducting qubit
Publication date: Available online 26 July 2016 Source:Comptes Rendus Physique Author(s): Yutaka Tabuchi, Seiichiro Ishino, Atsushi Noguchi, Toyofumi Ishikawa, Rekishu Yamazaki, Koji Usami, Yasunobu Nakamura The techniques of microwave quantum optics are applied to collective spin excitations in a macroscopic sphere of a ferromagnetic insulator. We demonstrate, in the single-magnon limit, strong coupling between a magnetostatic mode in the sphere and a microwave cavity mode. Moreover, we introduce a superconducting qubit in the cavity and couple the qubit with the magnon excitation via the virtual photon ...
Source: Comptes Rendus Physique - July 25, 2016 Category: Physics Source Type: research
