Abstract
Quantum Information The parity of a quantum mechanical wave function simply tells you if there is an odd or even number of excitations in the system it describes. Without the need to know the exact number of excitations within a system, being able to measure changes in parity is important and can be exploited in operations such as quantum error correction and stabilizing quantum communication protocols. Besse et al . demonstrate a detector that can determine the parity of a propagating microwave field. Using a superconducting phase qubit embedded in a cavity, they show that they can engineer the system such that transmission of the microwaves is conditional on there being an odd or even number of microwave photons in the radiation field. The simplicity of the detector design should have applications across a broad range of setups for quantum information processing. Phys. Rev. X 10 , 011046 (2020).
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