Super-activating quantum memory by entanglement-breaking channels

• URL: http://arxiv.org/abs/2410.13499v1
• Date: Thu, 17 Oct 2024 12:45:25 GMT
• Title: Super-activating quantum memory by entanglement-breaking channels
• Authors: Gelo Noel M. Tabia, Chung-Yun Hsieh,
• Abstract summary: Entanglement is an essential resource for various quantum-information tasks. In practice, entanglement can be exceedingly fragile during a system's evolution. We show that putting together two entanglement-breaking channels in a broadcasting scenario can activate their ability to maintain entanglement.
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• Abstract: Entanglement is an essential resource for various quantum-information tasks. When a target system shares entanglement with another memory system and is stored reliably, one can use entanglement at a later time -- this is quantum memory. In practice, entanglement can be exceedingly fragile during a system's evolution. In particular, no entanglement can survive when a so-called entanglement-breaking channel acts on the target system. Are entanglement-breaking channels really useless for maintaining entanglement? As a single channel, this is certainly the case; it cannot be useful for quantum memory. However, in this work, we show that putting together two entanglement-breaking channels in a broadcasting scenario can activate their ability to maintain entanglement -- the channel's quantum memory resource can be super-activated.

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