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Spin-encoded quantum computer near ultimate physical limits

Wang, Frank Z. (2024) Spin-encoded quantum computer near ultimate physical limits. Quantum Information Processing, 23 (4). Article Number 152. ISSN 1573-1332. (doi:10.1007/s11128-024-04358-1) (KAR id:105676)


Landauer’s bound is applicable to irreversible quantum operations. In this study, we showcased that the Doppler temperature manifests the existence of Landauer’s bound, which does not block a spin from (irreversibly) flipping with a tiny amount of energy via quantum tunneling. Verified by a spin–spin magnetic interaction experiment, this (energy) amount was determined to be only 1.25 times the theoretical value of Landauer’s bound. Based on Heisenberg’s principle, we defined information from a measuring perspective: one bit of information corresponds to the smallest error when quantifying the product of the measured energy uncertainty (delta E) and the measured time duration (delta t). We then illustrate an optically manipulated, spin-encoded, near-Landauer-bound, near-Heisenberg-limit quantum computer that encompasses this new definition of information. This study may represent the last piece of the puzzle in understanding both quantum Landauer erasure and Heisenberg’s quantum limit since a single spin is the smallest information carrier.

Item Type: Article
DOI/Identification number: 10.1007/s11128-024-04358-1
Uncontrolled keywords: Quantum computer · Qubit · Spin · Landauer’s bound · Heisenberg’s quantum limit
Subjects: Q Science > QA Mathematics (inc Computing science)
Q Science > QA Mathematics (inc Computing science) > QA 75 Electronic computers. Computer science
Q Science > QC Physics > QC174.12 Quantum theory
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Computing
Funders: European Research Council (
Depositing User: Frank Wang
Date Deposited: 18 Apr 2024 10:26 UTC
Last Modified: 26 Apr 2024 08:38 UTC
Resource URI: (The current URI for this page, for reference purposes)

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