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Quantum sensors based on diamond promise robustness but have limited sensitivity. Generating quantum correlations in the material might be a solution.

Coupled nanomechanical oscillators can show similar dynamics to two-level systems, and may eventually be used as quantum bits.

Nanodiamonds that are levitated by light and are equipped with internal spin provide a new platform for performing quantum and optomechanical experiments with massive, environmentally isolated objects.

Optical atomic clocks are useful tools for frequency metrology. Here the authors explore the stability of the atomic clocks and the role of the spin squeezed states for the noise reduction in these clocks.

An atom interferometer now maintains a spatial superposition state for 70 seconds, compared to few seconds in freely falling systems. This could improve measurements of the strength of gravitational fields and quantum gravity studies.

Achieving coherent quantum control over massive mechanical resonators via coupling to electrons or photons is a current research goal. Here, unambiguous evidence for strong coupling of cavity photons to a mechanical resonator is reported, paving the way for full quantum optical control of nano- and micromechanical devices.

Quantum teleportation has been previously demonstrated between objects of the same nature, such as light pulses or material particles. But this paper demonstrates teleportation between objects of a different nature: a quantum state encoded in a light pulse is teleported onto an atomic ensemble containing 10¹² caesium atoms.

Quantum logic spectroscopy gives precise measurements of atoms and molecules with long-lived states by transferring information to a second trapped ion via light pulses. By detecting photon recoil imparted to the trapped ion, Wan et al.extend this method to fast dipole-allowed transitions.

Atom interferometers can be useful for precision measurement of fundamental constants and sensors of different type. Here the authors demonstrate a compact twin-lattice atom interferometry exploiting Bose-Einstein condensates (BECs) of 87 Rb atoms.

Quantum metrology allows surpassing the standard quantum limit, but methods relying on squeezing require to know the orientation of the squeezed quadrature with respect to the signal. Here, instead, the authors propose a phase-insensitive Fock-state-based protocol, and demonstrate it using trapped ions.

A proposal describes how to detect topologically ordered states of ultracold matter in an optical lattice, and shows how these exotic states, which strongly correlated quantum systems can exhibit, could be harnessed for practical applications, such as robust quantum computation.

Atom interferometers are highly accurate sensors that use the interference of matter waves to extract knowledge about various quantities, such as the gravitational acceleration. In this work, the authors provide a new interferometer scheme that gives direct access to the gravitational gradient, i.e., higher order moments of the gravitational field.

Strongly correlated photon states are achieved using only weak coupling thanks to an ensemble of non-interacting waveguide-coupled atoms and collectively enhanced nonlinear interactions.

By coupling a mechanical object to an ensemble of atomic spins with negative effective mass, the object’s position can be measured without the usual quantum back-action perturbation of its momentum.