I don't think there's anything new here EXCEPT for the specific mechanism they used. If you measure something but don't preserve the information, you can keep entanglement. That's what the researchers show here - they have very low certainly measurements and aren't breaking entanglement.
>Weak measurement has provided new insight into the nature of quantum measurement, by demonstrating the ability to extract average state information without fully projecting the system. ... By correlating the results of weak ancilla measurements with subsequent projective readout, we achieve a violation of the BLGI with 27 s.d.s. of certainty.
Disclaimer: I'm just an amateur but keep up on the basics. I might be missing something very important
Circuit_Guy t1_j2av23a wrote
Reply to harnessing quantum mechanics, physicists discovered a new way to observe objects without directly looking at them. Using a superconducting qubit called a transmon device, they were able to “see” microwave pulses generated by classical instruments without having to absorb or re-emit any light waves. by MistWeaver80
I don't think there's anything new here EXCEPT for the specific mechanism they used. If you measure something but don't preserve the information, you can keep entanglement. That's what the researchers show here - they have very low certainly measurements and aren't breaking entanglement.
Here's a much older overview article of this technique: https://www.nature.com/articles/npjqi201522
>Weak measurement has provided new insight into the nature of quantum measurement, by demonstrating the ability to extract average state information without fully projecting the system. ... By correlating the results of weak ancilla measurements with subsequent projective readout, we achieve a violation of the BLGI with 27 s.d.s. of certainty.
Disclaimer: I'm just an amateur but keep up on the basics. I might be missing something very important