Decoherence mitigation by real-time noise acquisition
| Autor: | Andreas M. Waeber, M. Kaindl, G. Braunbeck, Friedemann Reinhard |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Coherence time
Quantum Physics Quantum decoherence Computer science Dephasing Bandwidth (signal processing) FOS: Physical sciences General Physics and Astronomy Observable 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Noise (electronics) Qubit 0103 physical sciences Electronic engineering Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Coherence (physics) |
| Popis: | We present a scheme to neutralize the dephasing effect induced by classical noise on a qubit. The scheme builds upon the key idea that this kind of noise can be recorded by a classical device during the qubit evolution, and that its effect can be undone by a suitable control sequence that is conditioned on the measurement result. We specifically demonstrate this scheme on a nitrogen-vacancy (NV) center that strongly couples to current noise in a nearby conductor. By conditioning the readout observable on a measurement of the current, we recover the full qubit coherence and its intrinsic coherence time $T_2$. We demonstrate that this scheme provides a simple way to implement single-qubit gates with an infidelity of $10^{-2}$ even if they are driven by noisy sources, and we estimate that an infidelity of $10^{-5}$ could be reached with additional improvements. We anticipate this method to find widespread adoption in experiments using fast control pulses driven from strong currents, in particular in nanoscale magnetic resonance imaging, where control of peak current s of 100 mA with a bandwidth of 100 MHz is required. |
| Databáze: | OpenAIRE |
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