Table-Top Tests of Fundamental Physics

Our lab investigates photonic-based table-top experiments to address  fundamental physics questions. We are particularly focused on developing novel methods, devices, and signal processing techniques to address three key problems that lie at the intersection of the foundations of quantum mechanics.

The first problem we aim to tackle is determining whether gravity is a classical or a quantum field. This involves experiments to measure gravitational forces exerted by particles as small as 100 nm in radius. Achieving such precision requires cutting-edge techniques in nanoparticle manipulation and ultra-sensitive force detection. Following this, we are developing schemes to generate and witness entanglement between these small masses. Successfully demonstrating entanglement in this context would provide compelling evidence for the quantum nature of gravity, challenging the traditional view of gravity as a purely classical field.

The second problem our lab focuses on is investigating whether general relativistic effects can manifest at the quantum level, particularly in causing decoherence. Specifically, we are designing experiments to observe decoherence effects induced by rotational reference frames, leveraging the Sagnac effect. This research aims to detect how rotational motion impacts quantum systems, offering new insights into the interface between quantum mechanics and general relativity, and potentially revealing previously unknown quantum aspects of general relativity.

Lastly, our lab is exploring the experimental feasibility of performing a series of measurements on a single quantum object to examine the validity of hidden variable theories. This involves continuous monitoring of quantum trajectories, where we aim to track the state of a single quantum system over time. By developing sophisticated signal processing techniques and high-precision measurement devices, we seek to determine if hidden variables could be influencing the quantum system’s behavior. Such experiments could provide critical evidence regarding the nature of quantum randomness and the possible existence of hidden variables.