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Microwave photonics with superconducting quantum circuits
Designing frequency-dependent relaxation rates and Lamb shifts for a giant artificial atom
In traditional quantum optics, where the interaction between atoms and light at optical frequencies is studied, the atoms can be approximated as pointlike when compared to the wavelength of light. So…
Decoherence-Free Interaction between Giant Atoms in Waveguide Quantum Electrodynamics.
This work shows that the giant atoms can be protected from decohering through the waveguide, but still have exchange interactions mediated by the wave guide, and shows how this decoherence-free interaction can be designed in setups with multiple atoms to implement, e.g., a 1D chain of atoms with nearest-neighbor couplings or a collection of atom with all-to-all connectivity.
Quantum Acoustics with Surface Acoustic Waves
It has recently been demonstrated that surface acoustic waves (SAWs) can interact with superconducting qubits at the quantum level. SAW resonators in the GHz frequency range have also been found to…
Circuit quantum acoustodynamics with surface acoustic waves
Measurements are presented of a device in which a tuneable transmon qubit is piezoelectrically coupled to a surface acoustic wave cavity, realising circuit quantum acoustodynamic architecture that may be used to develop new quantum acoustic devices.
Probing the quantum vacuum with an artificial atom in front of a mirror
Quantum fluctuations of the vacuum are both a surprising and fundamental phenomenon of nature. Understood as virtual photons, they still have a very real impact, for instance, in the Casimir effects…
Quantum State Tomography with Conditional Generative Adversarial Networks
- Shahnawaz Ahmed, C. Munoz, F. Nori, A. F. Kockum
- Computer SciencePhysical Review Letters
- 7 August 2020
This work applies conditional generative adversarial networks (CGANs) to QST and demonstrates that the QST-CGAN reconstructs optical quantum states with high fidelity, using orders of magnitude fewer iterative steps, and less data, than both accelerated projected-gradient-based and iterative maximum-likelihood estimation.
Quantum nondemolition detection of a propagating microwave photon.
This work shows how a chain of solid-state three-level systems cascaded through circulators which suppress photon backscattering can be used to realize a quantum nondemolition measurement of a single propagating microwave photon.
Tunable Chiral Bound States with Giant Atoms.
Tunable chiral bound states in a system composed of superconducting giant atoms and a Josephson photonic-crystal waveguide (PCW) can be used as a tunable toolbox to realize topological phase transitions and quantum simulations.
Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in a regime where the qubit decay rates to the transmission line and to its own environment are…