> When you turn the computer off, it remembers what's on your harddrive.
Weird analogy. The computer doesn't remember – the individual storage units on a hard drive don't care whether the machine around them has power or not They are indifferent to what's going on in the system which contains them as opposed to, say, the storage units in DRAM. Are you trying to say that at the moment all qubits we've made behave like the storage units in DRAM? In other words, while the system that contains them is powered on they remain in the same state but when the power is removed they become disordered? Aren't qubits an abstraction? I mean, qubit : bit :: qubit storage unit X : harddrive bit – or – qubit : bit :: qubit storage unit Y : DRAM bit – see what I mean?
Yeah this quantum memory is a passive memory, as opposed to active error correction, which is perhaps more akin to the DRAM side of things. The active error correction is what google etc. are working on right now. It's not clear if passive quantum memories will ever be built, or as i said, if they even can be theoretically built.
Cool, that's what I was trying to find out from you. Is this [Quantum Error Correction for Quantum Memories](https://arxiv.org/abs/1302.3428) from 2013, rev. 2015 by Barbara M. Terhal representative of the state of the art?
I know people have been looking into MBL and quantum memories, the problem seems to be that symmetries you'd need for topological phases either wreck MBL (beyond like SU(2)) or are the result of some quantum integrability (which also is not good for MBL)
source: my advisor works on passive error correction
Very interesting! I had to look at some of your other comments to find out that MBL is "many-body localization" which i've heard of but know very little about.
Weird analogy. The computer doesn't remember – the individual storage units on a hard drive don't care whether the machine around them has power or not They are indifferent to what's going on in the system which contains them as opposed to, say, the storage units in DRAM. Are you trying to say that at the moment all qubits we've made behave like the storage units in DRAM? In other words, while the system that contains them is powered on they remain in the same state but when the power is removed they become disordered? Aren't qubits an abstraction? I mean, qubit : bit :: qubit storage unit X : harddrive bit – or – qubit : bit :: qubit storage unit Y : DRAM bit – see what I mean?