Superposed trajectory enhances temporal steering under quantum metrological task

Kuan-Yi Lee^1*, Jhen-Dong Lin¹, Yi-Te Huang¹, Huan-Yu Ku¹, Yueh-Nan Chen¹

¹Physics, National Cheng Kung University, Tainan, Taiwan

* Presenter:Kuan-Yi Lee, email:lee1996221@gmail.com

Temporal steering (a temporal quantum correlation) plays a crucial role in many quantum information tasks. Here, we use a metrological task to witness the temporal steering, when the physical unknown parameter appears with some noise that causes the system to decoherence. We let the system pass through a superposed trajectory which is controlled by a control qubit. Under a suitable post-measurement on control qubit, we find that it can enhance the metrological steering inequality's violative quantity.

Keywords: Quantum steering, Quantum metrology, Superposed trajectory