# Quantum-enhanced sensing of a single-ion mechanical oscillator

@article{McCormick2019QuantumenhancedSO, title={Quantum-enhanced sensing of a single-ion mechanical oscillator}, author={K. McCormick and J. Keller and S. Burd and D. Wineland and Andrew C. Wilson and D. Leibfried}, journal={Nature}, year={2019}, pages={1-5} }

Special quantum states are used in metrology to achieve sensitivities below the limits established by classically behaving states1,2. In bosonic interferometers, squeezed states3, number states4,5 and ‘Schrödinger cat’ states5 have been implemented on various platforms and have demonstrated improved measurement precision over interferometers using coherent states6,7. Another metrologically useful state is an equal superposition of two eigenstates with maximally different energies; this state… Expand

#### 26 Citations

Heisenberg-limited single-mode quantum metrology in a superconducting circuit

- Physics, Medicine
- Nature Communications
- 2019

A single-mode phase estimation that approaches the Heisenberg limit (HL) unconditionally using Fock states superpositions in a superconducting qubit-oscillator system is demonstrated. Expand

Direct Characteristic-Function Tomography of Quantum States of the Trapped-Ion Motional Oscillator.

- Medicine, Physics
- Physical review letters
- 2020

Direct readout of the symmetric characteristic function of quantum states of the motional oscillation of a trapped calcium ion is implemented, and a range of archetypal quantum oscillator states, including displaced and squeezed Gaussian states as well as two and three component superpositions of displaced squeezed states are applied. Expand

Protocol for Precise Field Sensing in the Optical Domain with Cold Atoms in a Cavity.

- Physics, Medicine
- Physical review letters
- 2020

It is demonstrated that metrological gains of 10-20 dB below the standard quantum limit are within reach for current cavity-QED systems operating with long-lived alkaline-earth atoms. Expand

Quantum Interferometer Combining Squeezing and Parametric Amplification.

- Physics, Medicine
- Physical review letters
- 2020

A compact quantum interferometers involving two optical parametric amplifiers and the squeezed states generated within the interferometer are directly used for the phase-sensing quantum state is proposed and experimentally demonstrated. Expand

Non-Markovian sensing of a quantum reservoir

- Physics
- 2020

Quantum sensing explores protocols using quantum resource of sensors to achieve highly sensitive measurement to physical quantities. The conventional schemes generally use the unitary dynamics of the… Expand

Quantum-enhanced sensing of displacements and electric fields with two-dimensional trapped-ion crystals

- Physics, Medicine
- Science
- 2021

Quantum enhanced sensing Harnessing quantum mechanical effects is expected to provide an advantage over classical sensing technology. By entangling the center-of-mass motional state of approximately… Expand

Using states with a large photon number variance to increase quantum Fisher information in single-mode phase estimation

- Physics
- Journal of Physics Communications
- 2019

When estimating the phase of a single mode, the quantum Fisher information for a pure probe state is proportional to the photon number variance of the probe state. In this work, we point out… Expand

Optical estimation of Gaussian processes without phase reference using Fock states

- Physics
- 2020

While a general Gaussian process is phase sensitive, a stable phase reference is required to take advantage of this feature. When the reference is missing, either due to volatile nature of the… Expand

Generalized quantum steering ellipsoids for a qubit-field system

- Physics
- 2020

Quantum steering in a system consisting of a qubit coupled to a single-mode field are explored when classical-like measurements implemented by heterodyne detection schemes that collapse the state of… Expand

Quantum logic inspired techniques for spacetime-symmetry tests with (anti-)protons

- Physics
- 2021

Cosmological observations as well as theoretical approaches to physics beyond the standard model provide strong motivations for experimental tests of fundamental symmetries, such as CPT invariance.… Expand

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