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Circuit evaluation of SWAP and controlled operations with multiple controls and/or multiple targets. #18

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stewdio opened this issue Apr 30, 2020 · 0 comments
Open

Circuit evaluation of SWAP and controlled operations with multiple controls and/or multiple targets. #18

stewdio opened this issue Apr 30, 2020 · 0 comments
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Enhancement New feature or request Help wanted Extra attention is needed Q.Circuit

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@stewdio
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stewdio commented Apr 30, 2020

Currently Q.Circuit.evaluate does not correctly handle SWAP operations. (Thankfully, a SWAP gate can be emulated by three zippered CNOT gates instead.) And we’re also not correctly handling controlled operations that have more than one control or more than one target.

Both issues are tied together. Currently we assume component #0 of a multi-register gate is the control and subsequent components are the targets. This means a SWAP operation is interpreted as being a controlled operation of type SWAP. This is unintended.

We’re going to have to rethink how we designate what is a control and what is a target.
@stewdio stewdio added Enhancement New feature or request Help wanted Extra attention is needed Q.Circuit labels Apr 30, 2020
@stewdio stewdio mentioned this issue May 2, 2020
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