What is 'Ghost Murmur', the secret tool CIA used to locate US fighter pilot in Iran?

CIA reportedly used 'Ghost Murmur', a new tool that detects heartbeats from miles away, to locate a US fighter pilot who was shot down in Iran. The tool uses quantum magnetometry to detect electromagnetic signals generated by heartbeats, with AI processing them to isolate the signature from surrounding noise. It relies on sensors built using microscopic defects in synthetic diamonds.