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Establishing multi-degree-of-freedom entangled memories is important for high-capacity quantum communications and computing. Here, authors experimentally demonstrate hyper- and hybrid entanglement between two atomic ensembles in multiple degrees of freedom including path and orbital angular momentum.

Dissipative many body systems provide quantum-enhanced sensitivity to external near gap-closing points. Here, the authors demonstrate record sensitivity in a Rydberg-atomic platform in correspondence of folded hysteresis trajectories under external microwave driving

A quantum memory based on a Raman scheme is implemented for photonic qubits encoded in the path and polarization of single photons. The performance is quantified before and after storage in cold atomic ensembles and the storage bandwidth is ∼140 MHz.

Photonic quantum memories are necessary for quantum information networks and can be built using cold atomic gases. In this work, Ding et al. show the first storage and retrieval of single photons carrying orbital angular momentum using electromagnetically induced transparency in a cold rubidium ensemble.

Coherence is widely seen as essential for quantum source quality. Here, authors demonstrate on-chip photon states with increased brightness and purity using incoherent light. It reveals the mechanism of pump coherence and lowers the barrier for the generation of high-quality quantum states.

Long-range interactions in many-body quantum systems may induce dissipation channels described by non-Hermitian dynamics. Here, the authors report the observation of higher-order exceptional points, a hallmark of non-Hermitian physics, in a Rydberg atom gas. This enables design of quantum dynamics around these points, providing insight into phase transitions.

The time crystal is an exotic phase of matter where time-translational symmetry is broken. Here, the authors observe multiple continuous dissipative time crystals and bifurcation of time crystals in driven and dissipative Rydberg atomic gas.

Discrete-time crystal (DTC) is a special phase of matter that exhibits a spontaneous breaking of the discrete time translational symmetry. Here, Bang Liu et al. demonstrate an experimental approach to observe higher-order and fractional DTCs in Floquet-driven Rydberg atomic gases.

Harnessing multiple degrees of freedom of quantum states on chip could improve quantum information processing. Here, the authors demonstrate coherent conversion of quantum states between path, polarization and transverse waveguide-mode degrees of freedom in a quantum photonic integrated circuit.

Interacting quantum systems near criticality have been proposed as potential probes for quantum metrology. An experiment with Rydberg atoms now proves the enhanced sensitivity of critical many-body systems to small variations in external parameters.

Rydberg atoms are sensitive to microwave signals and hence can be used to detect them. Here the authors demonstrate a Rydberg receiver enhanced by deep learning, Rydberg atoms acting as antennae, to receive, extract, and decode the multi-frequency microwave signal effectively.

One of the core notions of quantum mechanics are cat states, pictorially described as a cat being simultaneously dead and alive. The authors describe an experimental realisation to generate a classical analogy to cat states using the orbital angular momentum degree of freedom of light and simulate the dynamical behaviours of the cat state in phase space.

The interaction between orbital angular momentum (OAM) of light and atoms can be used to store and retrieve high-dimensional information and hence has been proposed as an efficient way for quantum information networks. The authors present a scheme to store photons with a large OAM by implementing classical write and read pulses in higher OAM states.