Quantum technologies exploit entanglement to revolutionize computing, measurements, and
communications. This has stimulated the research in different areas of physics to engineer …

Quantum entanglement has been generated and verified in cold-atom experiments and
used to make atom-interferometric measurements below the shot-noise limit. However …

ABSTRACT A new type of quantum interferometer was recently realized that employs
parametric amplifiers (PAs) as the wave splitting and mixing elements. The quantum …

We experimentally demonstrate a nonlinear detection scheme exploiting time-reversal
dynamics that disentangles continuous variable entangled states for feasible readout. Spin …

Since the pioneering work of Ramsey, atom interferometers are employed for precision
metrology, in particular to measure time and to realize the second. In a classical …

We propose a versatile Loschmidt echo protocol to detect and quantify multiparticle
entanglement. It allows us to extract the quantum Fisher information for arbitrary pure states …

Although SU (1, 1) interferometry achieves Heisenberg-limited sensitivities, it suffers from
one major drawback: Only those particles outcoupled from the pump mode contribute to the …

Useful quantum metrology requires nonclassical states with a high particle number and
(close to) the optimal exploitation of the state's quantum correlations. Unfortunately, the …

Quantum entanglement can provide enhanced measurement precision beyond the standard
quantum limit, the highest precision achievable with classical means. However …

We investigate a non-Hermitian model featuring nonreciprocal gradient hoppings. Through
an in-depth analysis of the Liouvillian spectrum and dynamics, we confirm the emergence of …