Quasideterministic realization of a universal quantum gate in a single scattering process

2011/07/31 by F. Ciccarello, Francesco Ciccarello, Dan E. Browne +7 · 1 citation
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum optics and atomic interactions #cond-mat.mes-hall #quant-ph

paper · pdf · doi:10.1103/physreva.85.050305

published as Phys. Rev. A 85, 050305(R) (2012) · 7 pages, 3 figures (including Suppl. Mater.)

openalex publication_date 2012/05/17 · arxiv created 2012/05/24 · arxiv updated 2012/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04

Abstract

We show that a flying particle, such as an electron or a photon, scattering along a one-dimensional waveguide from a pair of static spin-(1)/(2) centers, such as quantum dots, can implement a controlled-z gate (universal for quantum computation) between them. This occurs quasideterministically in a single scattering event, with no need for any postselection or iteration and without demanding the flying particle to bear any internal spin. We show that an easily matched hard-wall boundary condition along with the elastic nature of the process are key to such performances.

Citations

• Resonant scattering can enhance the degree of entanglement
• Repeat-until-success quantum computing using stationary and flying qubits
• Entanglement generation by qubit scattering in three dimensions
• Extraction of Singlet States from Noninteracting High-Dimensional Spins
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Robust Creation of Entanglement between Ions in Spatially Separate Cavities

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