Improving Metrological Limit via Weak Measurement and Quantum Measurement Reversal
Author(s)
Liu, Lijun
Qi, Bo
Cheng, Shuming
Xi, Zairong
Griffith University Author(s)
Year published
2015
Metadata
Show full item recordAbstract
Quantum parameter estimation is of fundamental importance in physics. Quantum resources, involving for instance entangled probes, offer a significant improvement in estimation precision over classical strategies for closed quantum systems. However, when noises such as decoherence are taken into account, the quantum gain may be jeopardized. In this paper, we show how the amplitude-damping decoherence degrades the estimation precision from the Heisenberg limit to the standard limit with the initial Greenberger-Horne-Zeilinger (GHZ) state being employed and demonstrate that the method of weak measurement and quantum measurement ...
View more >Quantum parameter estimation is of fundamental importance in physics. Quantum resources, involving for instance entangled probes, offer a significant improvement in estimation precision over classical strategies for closed quantum systems. However, when noises such as decoherence are taken into account, the quantum gain may be jeopardized. In this paper, we show how the amplitude-damping decoherence degrades the estimation precision from the Heisenberg limit to the standard limit with the initial Greenberger-Horne-Zeilinger (GHZ) state being employed and demonstrate that the method of weak measurement and quantum measurement reversal can recover this estimation precision to the Heisenberg limit, even though at the price of a very low success probability.
View less >
View more >Quantum parameter estimation is of fundamental importance in physics. Quantum resources, involving for instance entangled probes, offer a significant improvement in estimation precision over classical strategies for closed quantum systems. However, when noises such as decoherence are taken into account, the quantum gain may be jeopardized. In this paper, we show how the amplitude-damping decoherence degrades the estimation precision from the Heisenberg limit to the standard limit with the initial Greenberger-Horne-Zeilinger (GHZ) state being employed and demonstrate that the method of weak measurement and quantum measurement reversal can recover this estimation precision to the Heisenberg limit, even though at the price of a very low success probability.
View less >
Conference Title
34th Chinese Control Conference
Subject
Quantum physics not elsewhere classified