quantum limit

== English == === Etymology === The spectroscopic sense is first attested in the 1920s; the measurement sense was coined by Vladimir Braginsky in a 1967 paper, and was originally restricted to the study of gravitational waves. === Noun === quantum limit (plural quantum limits) (quantum mechanics) The limit on measurement accuracy at quantum scales due to back-action effects. (spectroscopy) The shortest wavelength in an X-ray spectrum. ==== Derived terms ==== standard quantum limit (SQL)