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Sep 29 '19 at 14:17 answer Mark S timeline score: 8
Sep 29 '19 at 5:26 comment added Sanchayan Dutta @MarkS This is the supplementary material
Sep 28 '19 at 19:03 comment added Mark S I am not entirely sure! Maybe it's a SWAP with a Cz... they say on page 3 "We perform two-qubit iSWAP-like entangling gates by bringing neighboring qubits on resonance and turning on a 20 MHz coupling for 12 ns, which allows the qubits to swap excitations. During this time, the qubits also ex-perience a controlled-phase (CZ) interaction, which orig-inates from the higher levels of the transmon."
Sep 28 '19 at 17:50 comment added Sanchayan Dutta @MarkS Umm, you mean all A = SWAP, B = SWAP, ..., E = SWAP, ..., H = SWAP? If so, why do they call the arrangement ABCDCDAB intractable whereas they call the EFGHEFGH simplfiable? If all the 2-qubit gates were simply swap gates there would be no difference between the two sequences, isn't it? Or perhaps not, as which two qubits they're swapping also matters...that is, that alphabets (A...D, E...H) denote which two qubits are being swapped rather than acting as labels for the 2-qubit gates themselves. Though, I should ask...why exactly do you think/feel that they're swap gates?
Sep 28 '19 at 17:41 comment added Sanchayan Dutta @MarkS What does "efficiently simulable" even mean for two-qubit gates? All 2-qubit gates are simply $4\times 4$ matrices and should be simulable in almost equivalent time...
Sep 28 '19 at 17:11 history edited Sanchayan Dutta CC BY-SA 4.0
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Sep 28 '19 at 17:05 history edited Sanchayan Dutta CC BY-SA 4.0
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Sep 28 '19 at 16:55 history asked Sanchayan Dutta CC BY-SA 4.0