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I recently read that the Amaravati Quantum Valley facility achieved a landmark by cooling their indigenous dilution refrigerator down to 4 Kelvin (-269°C). While I understand that quantum computing components require extremely cold temperatures to operate effectively, I am curious about the specific technical significance of the 4 Kelvin threshold. Why is this particular temperature considered the first major benchmark before aiming for ultra-low millikelvin states? What specific hardware components or superconducting materials can now be tested at this stage?