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This study experimentally demonstrates the cancellation of noisy quantum channels and the superactivation of quantum capacity using Nuclear Magnetic Resonance (NMR) registers. By leveraging destructive interference between dephasing and depolarizing channels, the research offers a viable pathway to recover coherence and enhance quantum communication protocols despite inherent noise. These findings provide a concrete method for mitigating channel degradation, a critical step toward scaling practical quantum technologies.
Noise cancellation by superposition of channels and superactivation of quantum capacity: Experimental realization by NMR
arXiv:2606.10744v1 Announce Type: new Abstract: Noisy quantum channels degrade quantum resources such as coherence and entanglement and hence pose challenges for realizing quantum technologies. Coherent control of noisy channels allows us to minimize their effects on the quantum system. Here we achieve the cancellation of two noisy quantum channels by superposing their corresponding Stinespring dilation unitaries. We first arrive at conditions under which superposition of channels results in a valid quantum channel. We then consider superposing two dephasing channels and observe their destructive interference, thereby effectively recovering the quantum coherence. On superposing two zero-capacity depolarizing channels, we show superactivation of quantum capacity. We experimentally realize the cancellation of two dephasing channels using a three-qubit NMR register. Furthermore, using a five-qubit NMR register, we realize the cancellation of two depolarization channels and demonstrate superactivation of quantum capacity.
Abstract:Noisy quantum channels degrade quantum resources such as coherence and entanglement and hence pose challenges for realizing quantum technologies. Coherent control of noisy channels allows us to minimize their effects on the quantum system. Here we achieve the cancellation of two noisy quantum channels by superposing their corresponding Stinespring dilation unitaries. We first arrive at conditions under which superposition of channels results in a valid quantum channel. We then consider superposing two dephasing channels and observe their destructive interference, thereby effectively recovering the quantum coherence. On superposing two zero-capacity depolarizing channels, we show superactivation of quantum capacity. We experimentally realize the cancellation of two dephasing channels using a three-qubit NMR register. Furthermore, using a five-qubit NMR register, we realize the cancellation of two depolarization channels and demonstrate superactivation of quantum capacity.
arXiv:2606.10744 [quant-ph]
(or arXiv:2606.10744v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2606.10744 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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