Photon counting statistics in Gaussian bosonic networks
Kansanen, Kalle Sulo Ukko LU
; Portugal, Pedro
; Flindt, Christian
and Samuelsson, Peter
LU
(2025)
In SciPost Physics
18(4).
- Abstract
The statistics of transmitted photons in microwave cavities play a foundational role in microwave quantum optics and its technological applications. By utilizing quantum mechanical phase-space methods, we here develop a general theory of the photon counting statistics in Gaussian bosonic networks consisting of driven cavities with beamsplitter interactions and two-mode-squeezing. The dynamics of the network can be captured by a Lyapunov equation for the covariance matrix of the cavity fields, which generalizes to a Riccati equation, when counting fields are included. By solving the Riccati equation, we obtain the statistics of emitted and absorbed photons as well as the time-dependent correlations encoded in waiting time distributions... (More)
The statistics of transmitted photons in microwave cavities play a foundational role in microwave quantum optics and its technological applications. By utilizing quantum mechanical phase-space methods, we here develop a general theory of the photon counting statistics in Gaussian bosonic networks consisting of driven cavities with beamsplitter interactions and two-mode-squeezing. The dynamics of the network can be captured by a Lyapunov equation for the covariance matrix of the cavity fields, which generalizes to a Riccati equation, when counting fields are included. By solving the Riccati equation, we obtain the statistics of emitted and absorbed photons as well as the time-dependent correlations encoded in waiting time distributions and second-order coherence functions. To illustrate our theoretical framework, we first apply it to a simple linear network consisting of two coupled cavities, for which we evaluate the photon cross-correlations and discuss connections between the photon emission statistics and the entanglement between the cavities. We then consider a bosonic circulator consisting of three coupled cavities, for which we investigate how a synthetic flux may affect the direction of the photon flow, similarly to recent experiments. Our general framework paves the way for systematic investigations of the photon counting statistics in Gaussian bosonic networks.
(Less)
- author
- Kansanen, Kalle Sulo Ukko
LU
; Portugal, Pedro
; Flindt, Christian
and Samuelsson, Peter
LU
- organization
- publishing date
- 2025-04
- type
- Contribution to journal
- publication status
- published
- subject
- in
- SciPost Physics
- volume
- 18
- issue
- 4
- article number
- 116
- publisher
- SciPost
- external identifiers
-
- scopus:105001713672
- ISSN
- 2542-4653
- DOI
- 10.21468/SciPostPhys.18.4.116
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: Copyright K. S. U. Kansanen et al.
- id
- 46581936-2913-4cd0-ac9a-27ceb208efd6
- date added to LUP
- 2025-08-25 13:32:29
- date last changed
- 2025-08-25 13:33:03
@article{46581936-2913-4cd0-ac9a-27ceb208efd6,
abstract = {{<p>The statistics of transmitted photons in microwave cavities play a foundational role in microwave quantum optics and its technological applications. By utilizing quantum mechanical phase-space methods, we here develop a general theory of the photon counting statistics in Gaussian bosonic networks consisting of driven cavities with beamsplitter interactions and two-mode-squeezing. The dynamics of the network can be captured by a Lyapunov equation for the covariance matrix of the cavity fields, which generalizes to a Riccati equation, when counting fields are included. By solving the Riccati equation, we obtain the statistics of emitted and absorbed photons as well as the time-dependent correlations encoded in waiting time distributions and second-order coherence functions. To illustrate our theoretical framework, we first apply it to a simple linear network consisting of two coupled cavities, for which we evaluate the photon cross-correlations and discuss connections between the photon emission statistics and the entanglement between the cavities. We then consider a bosonic circulator consisting of three coupled cavities, for which we investigate how a synthetic flux may affect the direction of the photon flow, similarly to recent experiments. Our general framework paves the way for systematic investigations of the photon counting statistics in Gaussian bosonic networks.</p>}},
author = {{Kansanen, Kalle Sulo Ukko and Portugal, Pedro and Flindt, Christian and Samuelsson, Peter}},
issn = {{2542-4653}},
language = {{eng}},
number = {{4}},
publisher = {{SciPost}},
series = {{SciPost Physics}},
title = {{Photon counting statistics in Gaussian bosonic networks}},
url = {{http://dx.doi.org/10.21468/SciPostPhys.18.4.116}},
doi = {{10.21468/SciPostPhys.18.4.116}},
volume = {{18}},
year = {{2025}},
}