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Dynamical Purification Phase Transition Induced by Quantum Measurements
Continuously monitoring the environment of a quantum many-body system reduces the entropy of (purifies) the reduced density matrix of the system, conditional on the outcomes of the measurements. We
Scalable Probes of Measurement-Induced Criticality.
A local order parameter for measurement-induced phase transitions is uncovered: the average entropy of a single reference qubit initially entangled with the system, which is likely to point to more efficient realizations of fault-tolerant quantum computation.
Coupling a Single Trapped Atom to a Nanoscale Optical Cavity
A deterministic interface between a single trapped rubidium atom and a nanoscale photonic crystal cavity is demonstrated and Precise control over the atom's position allows us to probe the cavity near-field with a resolution below the diffraction limit and to observe large atom-photon coupling.
All-Optical Switch and Transistor Gated by One Stored Photon
By stopping a light pulse in an atomic ensemble contained inside an optical resonator, the realization of an all-optical transistor is realized, in which one stored gate photon controls the resonator transmission of subsequently applied source photons.
Critical properties of the measurement-induced transition in random quantum circuits
We numerically study the measurement-driven quantum phase transition of Haar-random quantum circuits in $1+1$ dimensions. By analyzing the tripartite mutual information we are able to make a precise
Observation of three-photon bound states in a quantum nonlinear medium
The observation of traveling three-photon bound states in a quantum nonlinear medium where the interactions between photons are mediated by atomic Rydberg states demonstrates the ability to realize and control strongly interacting quantum many-body states of light.
Shuttling a single charge across a one-dimensional array of silicon quantum dots
Significant advances have been made towards fault-tolerant operation of silicon spin qubits, with single qubit fidelities exceeding 99.9%, several demonstrations of two-qubit gates based on exchange
Phonon-assisted gain in a semiconductor double quantum dot maser.
A microscopic model for the recently demonstrated double-quantum-dot maser finds that, in addition to the direct stimulated emission of photons, there is a large contribution from the simultaneous emission of a photon and a phonon, i.e., the phonon sideband, which dominates the overall gain.
Observation of measurement-induced quantum phases in a trapped-ion quantum computer
Crystal Noel,1,3,4,∗ Pradeep Niroula, Daiwei Zhu, Andrew Risinger, Laird Egan, Debopriyo Biswas, Marko Cetina, Alexey V. Gorshkov, Michael J. Gullans, David A. Huse, Christopher Monroe Joint Quantum
Semiconductor double quantum dot micromaser
A coherent microwave source that is driven by the tunneling of single electrons is demonstrated, and maser action is verified by comparing the statistics of the emitted microwave field above and below the maser threshold.