Parity Detection of Propagating Microwave Fields
Journal article, 2020

The parity of the number of elementary excitations present in a quantum system provides important insights into its physical properties. Parity measurements are used, for example, to tomographically reconstruct quantum states or to determine if the decay of an excitation has occurred, information that can be used for quantum error correction in computation or communication protocols. Here, we demonstrate a versatile parity detector for propagating microwaves, which distinguishes between radiation fields containing an even or odd number n of photons, both in a single-shot measurement and without perturbing the parity of the detected field. We showcase applications of the detector for direct Wigner tomography of propagating microwaves and heralded generation of Schrodinger cat states. This parity detection scheme is applicable over a broad frequency range and may prove useful, for example, for heralded or fault-tolerant quantum communication protocols.

Author

Jean-Claude Besse

Swiss Federal Institute of Technology in Zürich (ETH)

Simone Gasparinetti

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Michele C. Collodo

Swiss Federal Institute of Technology in Zürich (ETH)

Theo Walter

Swiss Federal Institute of Technology in Zürich (ETH)

Ants Remm

Swiss Federal Institute of Technology in Zürich (ETH)

Jonas Krause

Swiss Federal Institute of Technology in Zürich (ETH)

Christopher Eichler

Swiss Federal Institute of Technology in Zürich (ETH)

Andreas Wallraff

Swiss Federal Institute of Technology in Zürich (ETH)

Physical Review X

2160-3308 (ISSN)

Vol. 10 1 011046

Subject Categories

Accelerator Physics and Instrumentation

Atom and Molecular Physics and Optics

Other Physics Topics

DOI

10.1103/PhysRevX.10.011046

More information

Latest update

7/3/2020 6