Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Tomography of microwave states based on parametric interactions

Manuel A. Castellanos-Beltran, M. P. DeFeo, Adam J. Sirois, Leonardo Ranzani, Florent Lecocq, Raymond W. Simmonds, John D. Teufel, José Aumentado

Published Mar 3, 2014• 0 citations
OpenAlex

Related papers

Manipulation of non-classical microwave states using parametric interactions

Manuel A. Castellanos-Beltran, M. P. DeFeo, Adam J. Sirois +4 more

Bulletin of the American Physical Society•Mar 4, 2015•0 citations

Parametric Quantum State Tomography with HyperRBMs

Simon Tonner, Viet T. Tran, Richard Kueng

International Conference on Agents and Artificial Intelligence (ICAART)•Jan 1, 2026•0 citations

Quantum State Tomography of an Itinerant Squeezed Microwave Field

F. Mallet, Manuel A. Castellanos-Beltran, H. S. Ku +6 more

We perform state tomography of an itinerant squeezed state of the microwave field prepared by a Josephson parametric amplifier (JPA). We use a second JPA as a preamplifier to improve the quantum efficiency of the field quadrature measurement from 2% to 36%±4%. Without correcting for the detection inefficiency we observe a minimum quadrature variance which is 68(-7)(+9)% of the variance of the vacuum. We reconstruct the state's density matrix by a maximum likelihood method and infer that the squeezed state has a minimum variance less than 40% of the vacuum, with uncertainty mostly caused by calibration systematics.

arXiv:1012.0007•Physical Review Letters•Jun 1, 2011•204 citations

Tomography and Correlation Function Measurements of Itinerant Microwave Photons

Andreas J. Wallraff

Bulletin of the American Physical Society•Mar 22, 2011•0 citations

Hong-Ou-Mandel Interference with Microwave Photons: Doing Quantum Optics Experiments using Superconducting Circuits

Andreas J. Wallraff

Using modern micro and nano-fabrication techniques combined with superconducting materials we realize quantum electronic circuits in which we create, store, and manipulate individual microwave photons. The strong interaction of photons with superconducting quantum two-level systems allows us to probe fundamental quantum effects of microwave radiation and also to develop components for applications in quantum technology. Previously we have realized on-demand single photon sources which we have characterized using correlation function measurements [1] and full quantum state tomography [2]. For this purpose we have developed efficient methods to separate the quantum signals of interest from the noise added by the linear amplifiers used for quadrature amplitude detection [3]. We now regularly employ superconducting parametric amplifiers [4] to perform nearly quantum limited detection of propagating electromagnetic fields. These enable us to probe the entanglement which we generate on demand between stationary qubits and microwave photons freely propagating down a transmission line [5]. Using two independent microwave single photon sources, we have recently performed Hong-Ou-Mandel experiments at microwave frequencies [6] and have probed the coherence of two-mode multi-photon states at the out-put of a beam-splitter. The non-local nature of such states may prove to be useful for distributing entanglement in future small-scale quantum networks.

Bulletin of the American Physical Society•Jun 3, 2014•0 citations

Microwave CQED quantum tomography

George P. Miroshnichenko

The European Physical Journal D•Dec 1, 2016•2 citations
We perform state tomography of an itinerant squeezed state of the microwave field prepared by a Josephson parametric amplifier (JPA). We use a second JPA as a preamplifier to improve the quantum efficiency of the field quadrature measurement from 2% to 36%±4%. Without correcting for the detection inefficiency we observe a minimum quadrature variance which is 68(-7)(+9)% of the variance of the vacuum. We reconstruct the state's density matrix by a maximum likelihood method and infer that the squeezed state has a minimum variance less than 40% of the vacuum, with uncertainty mostly caused by calibration systematics.
Using modern micro and nano-fabrication techniques combined with superconducting materials we realize quantum electronic circuits in which we create, store, and manipulate individual microwave photons. The strong interaction of photons with superconducting quantum two-level systems allows us to probe fundamental quantum effects of microwave radiation and also to develop components for applications in quantum technology. Previously we have realized on-demand single photon sources which we have characterized using correlation function measurements [1] and full quantum state tomography [2]. For this purpose we have developed efficient methods to separate the quantum signals of interest from the noise added by the linear amplifiers used for quadrature amplitude detection [3]. We now regularly employ superconducting parametric amplifiers [4] to perform nearly quantum limited detection of propagating electromagnetic fields. These enable us to probe the entanglement which we generate on demand between stationary qubits and microwave photons freely propagating down a transmission line [5]. Using two independent microwave single photon sources, we have recently performed Hong-Ou-Mandel experiments at microwave frequencies [6] and have probed the coherence of two-mode multi-photon states at the out-put of a beam-splitter. The non-local nature of such states may prove to be useful for distributing entanglement in future small-scale quantum networks.