In a two-dimensional electron gas, collective superradiant decay of spin qubits occurs for emitter spacings up to sqrt(λ_F v_F/Δ), about a micrometer for typical NV centers.
Thus, a superradiant acceleration, ∂tR > 0, requires that the density of dipoles is larger than n > λ −2 SR/π ≈ λ−2 F / ln(4EF /¯h∆)π
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Correlated emission of electron-current waves
In a two-dimensional electron gas, collective superradiant decay of spin qubits occurs for emitter spacings up to sqrt(λ_F v_F/Δ), about a micrometer for typical NV centers.