Abstract
Magnon-photon coupling inside a cavity has been experimentally realized and has attracted significant attention for its potential docking with quantum information science. Whether this coupling implies the steady entanglement of photons and magnons is crucial for its usage in quantum information but is still an open question. Here we study the entanglement properties among magnons and photons in an antiferromagnet-light system and find that the entanglement between a magnon and a photon is nearly zero, while the magnon-magnon entanglement is very strong and can be even further enhanced through the coupling with the cavity photons. The maximum enhancement occurs when the antiferromagnet is resonant with the light. The essential physics can be well understood within the picture of cavity-induced cooling of the magnon-magnon state near its joint vacuum with stronger entanglement. Our findings can be used to cool magnetic magnons toward their ground state and may also be significant to extend the cavity spintronics to quantum manipulation. Furthermore, the hybrid antiferromagnet-light system provides a natural platform to manipulate the deep strong correlations of continuous modes with a generic stable condition and easy tunability.
| Original language | English |
|---|---|
| Article number | 014419 |
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Physical Review B |
| Volume | 101 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 2020 |
Bibliographical note
Funding Information:H.Y.Y. acknowledges the financial support from National Natural Science Foundation of China (NSFC) Grant No. 61704071. Q.Y.H acknowledges NSFC Grants (No. 11622428, No. 61675007, and No. 11975026) and Beijing Natural Science Foundation (Grant No. Z190005). M.-H. Y. acknowledges the NSFC Grants (No. 11875160 and No. U1801661), the Key-Area Research and Development Program of Guangdong Province (Grant No. 2018B030326001), the Natural Science Foundation of Guangdong Province (Grant No. 2017B030308003), the Guangdong Innovative and Entrepreneurial Research Team Program (Grant No. 2016ZT06D348), the Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. JCYJ20170412152620376, No. JCYJ20170817105046702, and No. KYTDPT20181011104202253), the Economy, Trade and Information Commission of Shenzhen Municipality (Grant No. 201901161512).
Publisher Copyright:
© 2020 American Physical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
Funding
H.Y.Y. acknowledges the financial support from National Natural Science Foundation of China (NSFC) Grant No. 61704071. Q.Y.H acknowledges NSFC Grants (No. 11622428, No. 61675007, and No. 11975026) and Beijing Natural Science Foundation (Grant No. Z190005). M.-H. Y. acknowledges the NSFC Grants (No. 11875160 and No. U1801661), the Key-Area Research and Development Program of Guangdong Province (Grant No. 2018B030326001), the Natural Science Foundation of Guangdong Province (Grant No. 2017B030308003), the Guangdong Innovative and Entrepreneurial Research Team Program (Grant No. 2016ZT06D348), the Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. JCYJ20170412152620376, No. JCYJ20170817105046702, and No. KYTDPT20181011104202253), the Economy, Trade and Information Commission of Shenzhen Municipality (Grant No. 201901161512).