6 papers
The Locality Gap: A Thermodynamic Law for Objective Facts
Maxim V. Churilov
Objective facts in quantum Darwinism are values recorded redundantly in many independently accessible fragments of the environment. Redundancy does not create additional logical in…
Finite Quantum Histories: Holonomy Spectra, Minimal Clocks, and Exact Clock-Change Covariance
Maxim V. Churilov
We solve cyclic finite-dimensional quantum histories for arbitrary time-dependent unitary steps, without assuming that one step has finite order. The propagation Hamiltonian is a u…
Fixed-Boost Wigner Noise: Strict Trace-Distance Contraction without Quantum Degradability
Maxim V. Churilov
A Lorentz boost acts on the canonical spin of a massive particle through a momentum-dependent Wigner rotation. We show that, for one fixed observer boost, reducing over an uncertai…
Maximal Classicalization of Finite-Group Quantum Reference-Frame Noise
Maxim V. Churilov
A finite quantum reference token with group-valued misalignment induces a random-unitary channel, but optimal degradation is generally an optimization over all quantum post-process…
Ancilla-Depth Phase Diagrams for Quantum Reference-Frame Comparison
Maxim V. Churilov
Comparing two noisy quantum reference frames as statistical experiments depends on the dimension of the ancillary memory available to the decision procedure. For finite-dimensional…
Passive spectral-admittance bounds and exact continuum certificates for multiresonator quantum-memory interfaces
Maxim V. Churilov
Broadband quantum-memory interfaces are often assessed by center-frequency impedance matching or by a sampled efficiency curve. Neither supplies an operational continuous-band cert…