# Demonstration of entanglement-enhanced phase estimation in solid

@article{Liu2015DemonstrationOE, title={Demonstration of entanglement-enhanced phase estimation in solid}, author={Gang-Qin Liu and Yu-Ran Zhang and Yan-Chun Chang and Jie-Dong Yue and Heng Fan and Xin-Yu Pan}, journal={Nature Communications}, year={2015}, volume={6} }

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…

## 22 Citations

Reply to ‘Enhancing a phase measurement by sequentially probing a solid-state system'

- PhysicsNature communications
- 2016

It is clarified that the entanglement between the two non-identical qubits is the crucial and decisive factor in the achieved enhancement of phase sensitivity, and the experimental technique used to encode the phases to qubits does not affect this conclusion.

Quantum metrology with spin cat states under dissipation

- PhysicsScientific reports
- 2015

This scheme provides a realizable way to achieve high-precision measurements via dissipative quantum systems of Bose atoms via spin cat states (a kind of non-Gaussian entangled states in superposition of two quasi-orthogonal spin coherent states) under dissipation.

Quantum thermometry in a squeezed thermal bath

- PhysicsPhysica Scripta
- 2020

We address the dephasing dynamics of the quantum Fisher information (QFI) for the process of quantum thermometry with probes coupled to squeezed thermal baths via the nondemolition interaction. We…

Beating the standard quantum limit under ambient conditions with solid-state spins

- PhysicsScience Advances
- 2021

A sub-SQL interferometer at ambient conditions by using a multispin system, namely, the nitrogen-vacancy (NV) defect in diamond, and the deterministic and joint initialization of NV negative state, NV electron spin, and two nuclear spins is realized at room temperature.

Proposal to test quantum wave-particle superposition on massive mechanical resonators

- Physicsnpj Quantum Information
- 2019

We present and analyze a proposal for a macroscopic quantum delayed-choice experiment with massive mechanical resonators. In our approach, the electronic spin of a single nitrogen-vacancy impurity is…

Phononic-waveguide-assisted steady-state entanglement of silicon-vacancy centers

- PhysicsPhysical Review A
- 2020

Multiparticle entanglement is of great significance for quantum metrology and quantum information processing. We here present an efficient scheme to generate stable multiparticle entanglement in a…

Thermal entanglement between π-electrons in silicene and photons; occurrence of phase transitions

- Physics
- 2017

Enhancing a phase measurement by sequentially probing a solid-state system

- PhysicsNature communications
- 2016

It is argued here that this claim to perform the first room temperature entanglement-enhanced phase measurement in a solid-state system is incorrect: their measurement is not enhanced because of the entanglements in their system, instead the enhancement comes from the fact that the phase shift is applied twice to their state.

Achieving the Heisenberg limit under general Markovian noise using quantum error correction without ancilla

- PhysicsQuantum Inf. Process.
- 2020

If the authors employ qubits for parameter sensing, it can be shown that one can restore Heisenberg limit via full and fast control without any ancilla, as long as the signal Hamiltonian of the probe system has nonvanishing component perpendicular to the noise.

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