TY - JOUR
T1 - Continuous-monitoring measured signals bounded by past and future conditions in enlarged quantum systems
AU - Ho, Le Bin
N1 - Funding Information:
We would like to thank Y. Kondo of Kindai University for useful discussions. This work was supported by JSPS KAKENHI Grant Number 19K14620.
Funding Information:
Acknowledgements We would like to thank Y. Kondo of Kindai University for useful discussions. This work was supported by JSPS KAKENHI Grant Number 19K14620.
Publisher Copyright:
© 2019, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - In a quantum system that is bounded by past and future conditions, weak continuous-monitoring forward-evolving and backward-evolving quantum states are usually carried out separately. Therefore, measured signals at a given time t cannot be monitored continuously. Here, we propose an enlarged quantum system method to combine these two processes together. Therein, we introduce an enlarged quantum state that contains both the forward- and backward-evolving quantum states. The enlarged state is governed by an enlarged master equation and propagates one-way forward in time. As a result, the measured signals at time t can be monitored continuously and can provide advantages in the signals amplification and signal processing techniques. Our proposal can be implemented on various physical systems, such as superconducting circuits, NMR systems, ion traps, quantum photonics, and among others.
AB - In a quantum system that is bounded by past and future conditions, weak continuous-monitoring forward-evolving and backward-evolving quantum states are usually carried out separately. Therefore, measured signals at a given time t cannot be monitored continuously. Here, we propose an enlarged quantum system method to combine these two processes together. Therein, we introduce an enlarged quantum state that contains both the forward- and backward-evolving quantum states. The enlarged state is governed by an enlarged master equation and propagates one-way forward in time. As a result, the measured signals at time t can be monitored continuously and can provide advantages in the signals amplification and signal processing techniques. Our proposal can be implemented on various physical systems, such as superconducting circuits, NMR systems, ion traps, quantum photonics, and among others.
KW - Continuous monitoring
KW - Enlarged systems
KW - Weak values
UR - http://www.scopus.com/inward/record.url?scp=85065905935&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85065905935&partnerID=8YFLogxK
U2 - 10.1007/s11128-019-2314-6
DO - 10.1007/s11128-019-2314-6
M3 - Article
AN - SCOPUS:85065905935
SN - 1570-0755
VL - 18
JO - Quantum Information Processing
JF - Quantum Information Processing
IS - 7
M1 - 206
ER -