Qubit Clock in Quantum Cosmology

Research output: Contribution to journalArticlepeer-review


We investigate the emergent time scenario in quantum cosmology based on the Page– Wotters approach. Using a quantum cosmological model with a qubit clock, it is demonstrated how the entanglement between the qubit clock and the geometry derives emergence of a time parameter, which defines evolution of the timeless quantum state of the universe. We show that the universe wave function conditioned by a qubit clock obeys the standard Schrödinger equation and the Fisher information for the clock state, which quantifies entanglement between the universe and the clock, and contributes as a negative energy density.

Original languageEnglish
Article number99
Issue number2
Publication statusPublished - Feb 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


Dive into the research topics of 'Qubit Clock in Quantum Cosmology'. Together they form a unique fingerprint.

Cite this