Detail Project and Funding

Cavity-enhanced Quantum optical Clocks


Funded by: European Commission  
Calls: ERANET cofund
Start date: 2018-03-01  End date: 2021-02-28
Total Budget: EUR 2.364.640,00  INO share of the total budget: EUR 200.475,00
Scientific manager: Filippo Levi   and for INO is: Franzosi Roberto

Organization/Institution/Company main assignee: INRIM

other Organization/Institution/Company involved:
CNRS / SYRTE – France
ICFO – Spain
Nicolaus Copernicus Univ. in Torun / UMK – Poland
Univ. Copenhagen / KU – Denmark

other INO’s people involved:
Gessner Manuel
Pezzè Luca
Smerzi Augusto
Bel-Hadj-Aissa Ghofrane
Nourmandipour Alireza
Vafafard Azar

Abstract: The “Atomic Quantum Clock” is a milestone of the European Quantum Technologies Timeline.
Q-Clocks seeks to establish a new frontier in the quantum measurement of time by joining state-of-the-art optical lattice clocks and the quantized electromagnetic field provided by an optical cavity.
The goal of the project is to apply advanced quantum techniques to state-of-the-art optical lattice clocks, demonstrating enhanced sensitivity while preserving long coherence times and the highest accuracy.
A three-fold atom-cavity system approach will be employed: the dispersive quantum non-demolition (QND) system in the weak coupling regime, the QND system in the strong collective coupling regime, and the quantum enhancement of narrow-linewidth laser light generation towards a continuous active optical frequency standard.
Cross-fertilization of such approaches will be granted by parallel theoretical investigations on the available and brand-new quantum protocols, providing cavity-assisted readout phase amplification, adaptive entanglement and squeezed state preparation protocols.
Novel ideas on quantum state engineering of the clock states inside the optical lattice will be exploited to test possible quantum information and communication applications.
By pushing the performance of optical atomic clocks toward the Heisenberg limit, Q-Clocks is expected to substantially enhance all utilizations of high precision atomic clocks, including tests of fundamental physics (test of the theory of relativity, physics beyond the standard model, variation of fundamental constants, search for dark matter) and applied physics (relativistic geophysics, chrono geodetic leveling, precision geodesy and time tagging in coherent high speed optical communication).
Finally, active optical atomic clocks would have a potential to join large scale laser interferometers in gravitational waves detection.

INO’s Experiments/Theoretical Study correlated:
Quantum entanglement
Microcanonical ensemble

The Scientific Results:
1) Entanglement estimation in non-optimal qubit states
A microcanonical entropy correcting finite-size effects in small systems
Entanglement distance for an arbitrary state of M qubits
On the origin of phase transitions in the absence of symmetry-breaking
Multipartite Entanglement at Finite Temperature
Sensitivity Bounds for Multiparameter Quantum Metrology
Frequentist and Bayesian Quantum Phase Estimation
Measuring geometric phases with a dynamical quantum Zeno effect in a Bose-Einstein condensate
Metrological Nonlinear Squeezing Parameter
Multipartite-entanglement tomography of a quantum simulator
Fast and optimal generation of entanglement in bosonic Josephson junctions
Sensitivity bounds for interferometry with Ising Hamiltonians
Entanglement distance for arbitrary M-qudit hybrid systems
Geometrical Aspects in the Analysis of Microcanonical Phase-Transitions