https://spectrum.ieee.org/techtalk/computing/hardware/intels49qubitchipaimsforquantumsupremacy

#1 Strilanc:
Did they give any numbers on the quality of the qubits? For example, IBM's 20 qubit chip has 2qubit operations with error rates on the order of 5% [1] (some pairs of qubits are better, some are worse). Quantum supremacy experiments require thousands of operations (tens of layers of parallel operations). Qubits with even a 1% error rate per operation just won't cut it.
1: https://youtu.be/T8uuq7Izl8?t=26m58s "Experimental quantum computing at IBM" [26:58]
(Disclosure: I work on Google's quantum team.)

#2 volkadav:
I guess taking every branch by default avoids the specter of branch prediction vulnerabilities?
(This is me failing my saving throw vs urge to make terrible nerd jokes.)

#3 Tempest1981:
What makes one quantum computer superior to another? Not number of qubits, I guess? IBM has a 50qubit machine.

#4 krisives:
I assume these are massive like DWave's systems? https://youtu.be/60OkanvToFI?t=392

#5 wejick:
What is it means for humanity?

#6 edcarter:
Is it vulnerable to meltdown?

#7 wopwops:
Breaking Bitcoin With a Quantum Computer
http://fortune.com/2018/01/06/breakingbitcoincybersaturday...
Quantum Resistant Ledger