Caslav Brukner
Institute for Quantum Optics and Quantum Information (IQOQI)

Project Title

Agents in superpositions: the covariance of physical laws in quantum reference frames

Project Summary

In our laboratories, we perform experiments with single quantum particles which can be in a superposition of different states or entangled with other particles, showing features which are strikingly different to the classical world. What would be the description of the world, if we could "sit" on a particle that is in a superposition state with respect to the laboratory frame of reference? The relational approach to physics suggests that the description from such a "quantum reference frame" is exactly the opposite: while for itself, the particle appears classical, it is the laboratory that is in a quantum superposition of states. In the current project, we aim at developing a quantum theory framework for a "quantum agent" that is "attached" to a quantum particle or a quantum field. The working hypothesis of the project is that although the features of observed systems - such as entanglement and superposition - are agent-dependent, the physical laws themselves remain the same for all agents (i.e. are invariant under the transformation between quantum reference frames).



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