Spatial noise filtering through error correction for quantum sensing
Quantum systems can be used to measure various quantities in their environment with high precision. Often, however, their sensitivity is limited by the decohering effects of this same environment. Dynamical decoupling schemes are widely used to filter environmental noise from signals, but their perf...
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| Format: | Article |
| Language: | English |
| Published: |
Nature Publishing Group,
2019-03-26T14:35:38Z.
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| Subjects: | |
| Online Access: | Get fulltext |
| Summary: | Quantum systems can be used to measure various quantities in their environment with high precision. Often, however, their sensitivity is limited by the decohering effects of this same environment. Dynamical decoupling schemes are widely used to filter environmental noise from signals, but their performance is limited by the spectral properties of the signal and noise at hand. Quantum error correction schemes have therefore emerged as a complementary technique without the same limitations. To date, however, they have failed to correct the dominant noise type in many quantum sensors, which couples to each qubit in a sensor in the same way as the signal. Here we show how quantum error correction can correct for such noise, which dynamical decoupling can only partially address. Whereas dynamical decoupling exploits temporal noise correlations in signal and noise, our scheme exploits spatial correlations. We give explicit examples in small quantum devices and demonstrate a method by which error-correcting codes can be tailored to their noise. United States. Army Research Office (grant W911NF-15-1-0548) National Science Foundation (U.S.) (grant PHY0551153) National Science Foundation (U.S.) (grant 1641064) Natural Sciences and Engineering Research Council of Canada. Postgraduate Scholarships-Doctoral Program |
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