Entangled Clock Networks beyond the Standard Quantum Limit
Abstract
State-of-the-art atomic clocks or other precision interferometers operate at or near the standard quantum limit, where the instrument precision improves as the square root of the participating particle number. The standard quantum limit is a consequence of the projection postulate where each atom is ultimately measured in one of two quantum states. This discretization of measurement results leads to quantum noise even when all technical and classical noise has been removed. The standard quantum limit can be overcome by using entangled states, where quantum correlations between different atoms can reduce the effect of quantum noise on the measurement. It is proposed to demonstrate a network of entangled atomic clocks as a prototype for a future network with improved time keeping and remote sensing abilities. In the process of developing and building this network, the PI and his group will experimentally implement new methods for quantum metrology with fast scrambling that create metrologically useful entangled states quickly and robustly, demonstrate an enhancement of the clock quality factor by employing multiple en-sembles, and develop new methods of optically generated entanglement that substantially reduce the atom-light entanglement as the main source of decoherence. The system will also be used to extend quantum metrology to > 104 atoms, and within 10 dB of the fundamental Heisenberg Limit. Furthermore, the spatial transport of many-atom entangled states will be demonstrated for future network applications. Finally, the twin paradox of Special Relativity in the presence of entanglement will be tested for the first time. Accurate timekeeping and inertial navigation, in particular, GPS-free navigation, are central to a number of naval missions. The present proposal is to develop techniques that will increase the timekeeping capabilities. They techniques developed in the present proposal will also serve to improve the performance of navigation sensors based on neutral atoms in a given bandwidth. Approved for Public Release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 24, 2023
- Source ID
- N000142312577
Entities
People
- Vladan Vuletić
Organizations
- Massachusetts Institute of Technology
- Office of Naval Research
- United States Navy