0577671 - FZÚ 2024 RIV AT eng J - Journal Article
Roszak, Katarzyna - Korbicz, J.
Purifying teleportation.
Quantum. Roč. 7, Feb. (2023), č. článku 923. ISSN 2521-327X. E-ISSN 2521-327X
Institutional support: RVO:68378271
Keywords : teleportation * decoherence * open quantum systems * quantum networks
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.1, year: 2023 ; AIS: 2.575, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.22331/q-2023-02-16-923

Coupling to the environment typically suppresses quantum properties of physical systems via decoherence. This is one of the main obstacles in practical implementations of quantum protocols. We show how decoherence can be reversed/suppressed during quantum teleportation in a network scenario. Treating the environment quantumly, we show that under a general pure dephasing coupling, performing a second teleportation can probabilistically reverse the decoherence effects if certain commutativity conditions hold. This effect is purely quantum and most pronounced for qubit systems, where in 25% of instances the decoherence can be reversed completely. We show the effect in a physical model of a qubit register coupled to a bosonic bath. We also analyze general d-dimensional systems, identifying all instances of decoherence suppression. Our results are proof-of-concept but will be relevant for the emerging field of quantum networks as teleportation is the key building block of network protocols.

Permanent Link: https://hdl.handle.net/11104/0346801