Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects (Entanglement and Decoherence)

Q 66.4: Talk

Friday, March 9, 2018, 11:15–11:30, K 1.013

Thermalization as an invisibility cloak for fragile quantum superpositions — •Walter Hahn¹ and Boris Fine^{1, 2} — ¹Skolkovo Institute of Science and Technology, Skolkovo Innovation Centre, Nobel Street 3, Moscow 143026, Russia — ²Institute for Theoretical Physics, Philosophenweg 12, 69120 Heidelberg, Germany

We propose a method for protecting fragile quantum superpositions in many-particle systems from dephasing by external classical noise. We call superpositions fragile if dephasing occurs particularly fast, because the noise couples very differently to the superposed states. The method consists of letting a quantum superposition evolve under the internal thermalization dynamics of the system, followed by a time-reversal manipulation known as Loschmidt echo. The thermalization dynamics makes the superposed states almost indistinguishable during most of the above procedure. We validate the method by applying it to a cluster of spins 1/2.