Demonstration of Entanglement-Enhanced Phase Estimation in Solid

Abstract

Precise parameter estimation plays a central role in science and technology. The statistical error in estimation can be decreased by repeating measurement, leading to that the resultant uncertainty of the estimated parameter is proportional to the square root of the number of repetitions in accordance with the central limit theorem. Quantum parameter estimation, an emerging field of quantum technology, aims to use quantum resources to yield higher statistical precision than classical approaches. Here, we report the first room-temperature implementation of entanglement-enhanced phase estimation in a solid-state system: the nitrogen-vacancy centre in pure diamond. We demonstrate a super-resolving phase measurement with two entangled qubits of different physical realizations: an nitrogen-vacancy centre electron spin and a proximal ${}^{13}$C nuclear spin. The experimental data shows clearly the uncertainty reduction when entanglement resource is used, confirming the theoretical expectation. Our results represent an elemental demonstration of enhancement of quantum metrology against classical procedure.

arXiv comment9 pages including the supplementary material, 6 figures in main text plus 3 figures in supplementary material

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• Dissipative Quantum Metrology with Spin Cat States
• Beating the Standard Quantum Limit under Ambient Conditions with Solid-State Spins
• Observing information backflow from controllable non-Markovian multi-channels in diamond
• Quantum computation and simulation with vibrational modes of trapped ions
• Proposal to Test Quantum Wave-Particle Superposition on Massive Mechanical Resonators
• Optimal quantum parameter estimation in a pulsed quantum optomechanical system
• Phononic waveguide assisted steady state entanglement of SiV centers
• Feedback Ansatz for Adaptive-Feedback Quantum Metrology Training with Machine Learning
• Multipartite entanglement in the 1-D spin-$\frac{1}{2}$ Heisenberg Antiferromagnet
• Quantum thermometry in a squeezed thermal bath
• Multi-configurational nature of electron correlation within nitrogen vacancy centers in diamond
• Nuclear Magnetic Resonance model of an entangled sensor under noise
• Achieving Heisenberg limit under General Markov Noise without Ancilla
• Correspondence: Enhancing a phase measurement by sequentially probing a solid state system
• Optimal demonstration of Autler Townes splitting