Robust quantum sensing with strongly interacting probe systems
Quantum metrology: better sensing through interactions Using collections of quantum probes that continuously interact with each other could enable more precise frequency measurements. Without considering losses, the performance of quantum measurement devices can be improved by measuring for longer....
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| Main Authors: | , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
Nature Portfolio
2018
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| Subjects: | |
| Online Access: | https://doaj.org/article/4002203a272b487984edca153bccc967 |
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| Summary: | Quantum metrology: better sensing through interactions Using collections of quantum probes that continuously interact with each other could enable more precise frequency measurements. Without considering losses, the performance of quantum measurement devices can be improved by measuring for longer. In practice, this is not possible because coupling to the thermal environment introduces decoherence that limits the measurement time. Shane Dooley and colleagues from the National Institute of Informatics, Japan, have investigated theoretically how introducing strong mutual interactions to an ensemble of quantum systems can improve their collective sensitivity. The strong coupling changes how the environment affects the quantum coherence, allowing the sensing time to be extended by a factor that increases exponentially with the interaction strength and number of sensors. A simple, experimentally-realistic device with only two superconducting qubits could gain a 50% sensitivity increase using their new approach. |
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