A theoretical physicist who studied the relation between entanglement entropy and boundary area. In his 1993 calculation, a partial trace over the interior of an imaginary sphere in a free-field ground state leaves a mixed exterior state whose entropy scales with area. The example shows how quantum correlations across a boundary can produce an area law without introducing a material surface there.[ref]
Entropy and Area by Mark Srednicki. Abstract: tracing a massless free field over a sphere; coupled-oscillator construction in equations (1)–(5)
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