# Atomic clock interferometers: a test for a quantum generalization of Einstein’s Equivalence Principle and a quantum sensing analysis

### APA

Cepollaro, C. (2022). Atomic clock interferometers: a test for a quantum generalization of Einstein’s Equivalence Principle and a quantum sensing analysis. Perimeter Institute. https://pirsa.org/22060000

### MLA

Cepollaro, Carlo. Atomic clock interferometers: a test for a quantum generalization of Einstein’s Equivalence Principle and a quantum sensing analysis. Perimeter Institute, Jun. 03, 2022, https://pirsa.org/22060000

### BibTex

@misc{ pirsa_PIRSA:22060000, doi = {10.48660/22060000}, url = {https://pirsa.org/22060000}, author = {Cepollaro, Carlo}, keywords = {Quantum Foundations}, language = {en}, title = {Atomic clock interferometers: a test for a quantum generalization of Einstein{\textquoteright}s Equivalence Principle and a quantum sensing analysis}, publisher = {Perimeter Institute}, year = {2022}, month = {jun}, note = {PIRSA:22060000 see, \url{https://pirsa.org}} }

Carlo Cepollaro Austrian Academy of Sciences

## Abstract

It is unknown how the Einstein Equivalence Principle (EEP) should be modified to account for quantum features. A possibility introduced in arXiv:2012.13754 is that the EEP holds in a generalized form for particles having an arbitrary quantum state. The core of this proposal is the ability to transform to a Quantum Reference Frame (QRF) associated to an arbitrary quantum state of a physical system, in which the metric is locally inertial. I will show that this extended EEP, initially formulated in terms of the local expression of the metric field in a QRF, can be verified in an interferometric setup via tests on the proper time of entangled clocks (arXiv:2112.03303). Moreover, the same setup can be analyzed with quantum sensing techniques (arXiv:2204.03006): I will talk about how gravitational time dilation may be used as a resource in quantum information theory, showing that it may enhance the precision in estimating the gravitational acceleration for long interferometric times.