Single-Shot Quantum Nondemolition Detection of Individual Itinerant Microwave Photons

Open access
Author
Show all
Date
2018-04Type
- Journal Article
Citations
Cited 40 times in
Web of Science
Cited 41 times in
Scopus
ETH Bibliography
yes
Altmetrics
Abstract
Single-photon detection is an essential component in many experiments in quantum optics, but it remains challenging in the microwave domain. We realize a quantum nondemolition detector for propagating microwave photons and characterize its performance using a single-photon source. To this aim, we implement a cavity-assisted conditional phase gate between the incoming photon and a superconducting artificial atom. By reading out the state of this atom in a single shot, we reach an external (internal) photon-detection fidelity of 50% (71%), limited by transmission efficiency between the source and the detector (75%) and the coherence properties of the qubit. By characterizing the coherence and average number of photons in the field reflected off the detector, we demonstrate its quantum nondemolition nature. We envisage applications in generating heralded remote entanglement between qubits and for realizing logic gates between propagating microwave photons. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000258121Publication status
publishedExternal links
Journal / series
Physical Review XVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03720 - Wallraff, Andreas / Wallraff, Andreas
More
Show all metadata
Citations
Cited 40 times in
Web of Science
Cited 41 times in
Scopus
ETH Bibliography
yes
Altmetrics