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Circuit quantum electrodynamics in the ultrastrong-coupling regime
The Jaynes–Cummings model describes the interaction between a two-level system and a small number of photons. It is now shown that the model breaks down in the regime of ultrastrong coupling between…
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Quantum simulation of the Dirac equation
TLDR
A proof-of-principle quantum simulation of the one-dimensional Dirac equation using a single trapped ion set to behave as a free relativistic quantum particle and study Zitterbewegung for different initial superpositions of positive- and negative-energy spinor states.
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Ultrastrong coupling regimes of light-matter interaction
Recent experiments have demonstrated that light and matter can mix together to an extreme degree, and previously uncharted regimes of light-matter interactions are currently being explored in a…
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Digitized adiabatic quantum computing with a superconducting circuit.
TLDR
The demonstration of digitized adiabatic quantum computing in the solid state opens a path to synthesizing long-range correlations and solving complex computational problems.
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Operational families of entanglement classes for symmetric N-qubit States.
We solve the entanglement classification under stochastic local operations and classical communication (SLOCC) for all multipartite symmetric states in the general N-qubit case. For this purpose, we…
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Observation of the Bloch-Siegert shift in a qubit-oscillator system in the ultrastrong coupling regime.
We measure the dispersive energy-level shift of an LC resonator magnetically coupled to a superconducting qubit, which clearly shows that our system operates in the ultrastrong coupling regime. The…
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Deep strong coupling regime of the Jaynes-Cummings model.
TLDR
This work proposes an intuitive and predictive physical frame to describe the DSC regime where photon number wave packets bounce back and forth along parity chains of the Hilbert space, while producing collapse and revivals of the initial population.
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Digital quantum simulation of spin models with circuit quantum electrodynamics
Systems of interacting quantum spins show a rich spectrum of quantum phases and display interesting many-body dynamics. Computing characteristics of even small systems on conventional computers poses…
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Experimental observation of four-photon entangled Dicke state with high fidelity.
TLDR
The demonstration of a remarkable property: depending on the orientation of a measurement on one photon, the remaining three photons are projected into both inequivalent classes of genuine tripartite entanglement, the Greenberger-Horne-Zeilinger and W class.
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Quantum Rabi Model with Trapped Ions
We propose the quantum simulation of the quantum Rabi model in all parameter regimes by means of detuned bichromatic sideband excitations of a single trapped ion. We show that current setups can…
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