New differentially private turnstile-stream algorithms count distinct elements with O~(T^{1/3}) space and error, and a nearly matching lower bound for blocklisting-based methods.
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Differentially Private Space-Efficient Algorithms for Counting Distinct Elements in the Turnstile Model
New differentially private turnstile-stream algorithms count distinct elements with O~(T^{1/3}) space and error, and a nearly matching lower bound for blocklisting-based methods.