Onset of superactivation of quantum capacity
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Quantum Physics arXiv:2604.27042 (quant-ph) [Submitted on 29 Apr 2026] Title:Onset of superactivation of quantum capacity Authors:Marco Parentin, Bjarne Bergh, Nilanjana Datta, Mark M. Wilde View a PDF of the paper titled Onset of superactivation of quantum capacity, by Marco Parentin and 3 other authors View PDF HTML (experimental) Abstract:Superactivation of quantum capacity is the phenomenon whereby two quantum channels, each with zero quantum capacity, can exhibit a strictly positive capacity when used in tandem. In this work, we explore superactivation in the previously unexplored non-asymptotic regime of finitely many channel uses. We give a definition of finite-blocklength superactivation and propose numerical methods that can certify it. Then, focusing on the 50% erasure and positive-partial-transpose channels considered in the original work on superactivation, we show that as few as 17 uses of the joint channel already enable qubit transmission with a fidelity unattainable by any number of uses of either channel alone, demonstrating a strong finite-blocklength form of superactivation and opening the door to experimental demonstration. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.27042 [quant-ph] (or arXiv:2604.27042v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.27042 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Bjarne Bergh [view email] [v1] Wed, 29 Apr 2026 17:26:48 UTC (34,439 KB) Full-text links: Access Paper: View a PDF of the paper titled Onset of superactivation of quantum capacity, by Marco Parentin and 3 other authorsView PDFHTML (experimental)TeX Source view license Ancillary-file links: Ancillary files (details): bob_pov_0_block_0.npy bob_pov_0_block_1.npy bob_pov_0_block_2.npy bob_pov_0_block_3.npy bob_pov_0_block_4.npy bob_pov_0_block_5.npy bob_pov_0_block_6.npy bob_pov_0_block_7.npy bob_pov_0_block_8.npy bob_pov_10_block_0.npy bob_pov_10_block_1.npy bob_pov_10_block_10.npy bob_pov_10_block_11.npy bob_pov_10_block_12.npy bob_pov_10_block_13.npy bob_pov_10_block_14.npy bob_pov_10_block_15.npy bob_pov_10_block_16.npy 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decoder_8_block_20.npy decoder_8_block_21.npy decoder_8_block_22.npy decoder_8_block_23.npy decoder_8_block_24.npy decoder_8_block_3.npy decoder_8_block_4.npy decoder_8_block_5.npy decoder_8_block_6.npy decoder_8_block_7.npy decoder_8_block_8.npy decoder_8_block_9.npy decoder_9_block_0.npy decoder_9_block_1.npy decoder_9_block_10.npy decoder_9_block_11.npy decoder_9_block_12.npy decoder_9_block_13.npy decoder_9_block_14.npy decoder_9_block_15.npy decoder_9_block_16.npy decoder_9_block_17.npy decoder_9_block_18.npy decoder_9_block_19.npy decoder_9_block_2.npy decoder_9_block_20.npy decoder_9_block_21.npy decoder_9_block_22.npy decoder_9_block_23.npy decoder_9_block_24.npy decoder_9_block_3.npy decoder_9_block_4.npy decoder_9_block_5.npy decoder_9_block_6.npy decoder_9_block_7.npy decoder_9_block_8.npy decoder_9_block_9.npy encoder_block_0.npy encoder_block_1.npy encoder_block_2.npy encoder_block_3.npy encoder_block_4.npy encoder_block_5.npy encoder_block_6.npy encoder_block_7.npy encoder_block_8.npy fidelity_seesaw.npy fidelity_verified.npy n.npy verify_results.py(668 additional files not shown) You must enabled JavaScript to view entire file list. 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