Equation 11 · Part 2 · How Much of Gravitationally Induced Entanglement Is in the Eye of the Frame
subscript
subscript
What this part means
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
Its job in the formula
A subscript distinguishes a version, component, step, or member of a quantity. It does not automatically mean multiplication.
Full expression→subscript→Article meaning
The passage around this formula
The BMV protocol belongs to Bose and eight coauthors, and to Marletto and Vedral, who proposed it independently on the same day in 2017 [ 1 , 2 ] . The quantum-reference-frame formalism used throughout belongs to Giacomini, Castro-Ruiz and Brukner, refined onto perspective-neutral foundations by Vanrietvelde, Höhn, Giacomini and Castro-Ruiz, with the general principle that entanglement is frame-relative traceable further back to Peres and Terno for relativistic observers and to Bartlett, Rudolph and Spekkens for reference frames as a quantum resource more generally [ 4 , 5 , 7 , 8 ] . Christodoulou and Rovelli’s covariant reading of what the BMV effect actually is belongs to them [ 6 ] ; the…
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
Sources cited in the surrounding passage
- [6] On the possibility of laboratory evidence for quantum superposition of geometries ↗
- [3] Observable quantum entanglement due to gravity ↗
- [9] On two recent proposals for witnessing nonclassical gravity ↗
These citations provide research context; check each source for the exact claim it supports.