add paper link to README

GregDMeyer · May 4, 2022 · 3155c5a · 3155c5a
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@@ -4,7 +4,7 @@ This repository contains implementations for four different quantum circuits tha
 
 𝒰\|*x*⟩\|0⟩ = \|*x*⟩\|*x*<sup>2</sup> mod *N*⟩.
 
-This unitary is the key step in the "proof of quantumness" protocol described in this paper: [link forthcoming].
+This unitary is the key step in the "proof of quantumness" protocol described in this paper: [arXiv:2104.00687](https://arxiv.org/abs/2104.00687).
 
 The repository also contains code for analyzing the circuits.