Quantum-enhanced interferometry and the structure of twisted states

Abstract

Preparation of a non-classically correlated state is the first step of any quantum-enhanced interferometric protocol. An efficient method is the one-axis twisting, which entangles a collection of initially uncorrelated particles by means of two-body interactions. Here we investigate the limits of the quantum improvement which can be reached with this method in realistic experimental conditions. We demonstrate that the usefulness of this entangling mechanism is a result of fine structures introduced into the quantum state. The scale at which these structures vary allows us to identify the minimal requirements for the precision of the complete interferometric sequence. Our results---especially the explanation of the underlying principle of the entangling method---may help to develop ultra-precise interferometers.

5 pages, 2 figures

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Cited by in corpus (10)

• Detecting large quantum Fisher information with finite measurement precision
• One-axis twisting as a method of generating many-body Bell correlations
• Simulating the same physics with two distinct Hamiltonians
• Optimal Conventional Measurements for Quantum-Enhanced Interferometry
• Multiqubit matter-wave interferometry under decoherence and the Heisenberg scaling recovery
• Enhancing quantum state tomography via resource-efficient attention-based neural networks
• Generation of scalable many-body Bell correlations in spin chains with short-range two-body interactions
• Enhancing interferometric sensitivity by non-classical light from quantum non-demolition measurements in cavity QED
• Saturating the one-axis twisting quantum Cramér-Rao bound with a total spin readout
• Conditional Entanglement Amplification via Non-Hermitian Superradiant Dynamics