4 papers · 1 filter
Criterion for qubit-assisted quantum metrology approaching Heisenberg scaling
Peng Chen, Jun Jing
We study in this work the metrology precision of a probe system coupled to an ancillary qubit. Restricting the probe-qubit coupling along only one or two directions is found to be…
Precision limit under weak coupling with an ancillary qubit
Peng Chen, Jun Jing
We propose a measurement-based quantum metrology protocol in a composite model, where the probe system (a spin ensemble) is coupled to an ancillary two-level system (qubit) with a…
Achieving the Heisenberg limit of metrology via measurement on an ancillary qubit
Peng Chen, Jun Jing
In the scenario of the probe-ancilla interaction, we propose a quantum metrology protocol by the unconditional measurement on the ancillary qubit after an optimized period of joint…
Qubit-assisted quantum metrology under a time-reversal strategy
Peng Chen, Jun Jing
We propose a quantum metrology protocol based on a two-step joint evolution of the probe system and an ancillary qubit and quantum measurement. With a proper initial state of the a…