calculation
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Physics
New calculation of electron self-energy improves determination of fundamental constants
Feynman diagram representing the electron self-energy of two loops ((a) loop after loop, (b) overlap, and (c) nested). The double line indicates the electron in the presence of a bound nuclear field. Wavy lines indicate virtual photon exchange. Credit: Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.133.251803 After World War II, when quantum electrodynamics, the quantum field theory of electrons and photons,…
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Physics
Researchers achieve calculation of Jones polynomial based on Majorana zero modes
Experimental setup. (a) A conventional quantum cooling circuit consists of two Hadamard gates (𝐻), a local phase gate (𝑅), and a controlled unitary gate (𝑈). Here, a cnot gate (marked with a red dashed line) is newly introduced to realize non-dissipative imaginary time evolution (ITE) during the braiding motions 𝜎1 and 𝜎−12, and a Sagnac interferometer ( SI) has been…
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