Superposed trajectory enhances temporal steering under quantum metrological task
Kuan-Yi Lee1*, Jhen-Dong Lin1, Yi-Te Huang1, Huan-Yu Ku1, Yueh-Nan Chen1
1Physics, National Cheng Kung University, Tainan, Taiwan
* Presenter:Kuan-Yi Lee,
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