Casimir and the Qubit: Decoherence from Evanescent-wave Johnson Noise


Prof. Robert Joynt

Department of Physics, Univ. of Wisconsin, Madison, USA



The Casimir effect is a famous macroscopic consequence of quantum electrodynamics.It come from the fact that there is a zone of enhanced electromagnetic fluctuations surrounding metallic objects - their photon modes leak into the vacuum. This can create problems for qubits situated near metallic objects, as happens in many quantum computer architectures. I show how this effect causes decoherence of charge and spin quantum-dot qubits near metallic gates, analyzing in detail results for NV centers in diamond.