Sala 422 12:15 
Seminarium Instytutu

dr Thomas Bahder, ARO Tokyo

Topological Quantum Sensors?

I will review the theory of "conventional" quantum sensors as quantum channels of information between the quantity (classical field) to be sensed and the measurement outcomes. Next, I will briefly describe non-ideal quantum sensors, which perform non-unitary transformations on the input quantum state. The theory of non-ideal quantum sensors is relevant to experiments because the input quantum state may have errors, there may be scattering (decoherence and dispersion) in the quantum channel, and the output state detectors may not be ideal. Next, I will introduce simple 1-qubit and 2-qubit models of a quantum sensor that have an analogy with topological energy band theory. I will suggest that a new class of quantum sensors called "topological quantum sensors" may be realizable. Finally, I will give a detailed example of a topological quantum sensor of magnetic fields based on the dynamical quantum H all effect.