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Placed
Systems desk
Placed is the idea that every stage of a quantum workload should be assigned to a resource on purpose, and that the assignment should be written down before anything runs.
- Circuit as written
- Stage costs stated
- Placement decision
- Run on chosen resource
- Sample and compare
What placed means
A workload is rarely one thing. It has stages. Some prepare a state, some evolve it, some read it out. Each stage can run in more than one place.
Placed names the act of choosing. The Systems desk starts from the circuit as written, in the form given in the quantum circuit model. It then asks where each part should run. The answer is recorded, not assumed. That record is what we mean by placed.
How a placement is chosen
The choice follows from costs the desk can state. Exact simulation stores the full state, and that memory grows exponentially with qubit count. This is the territory of state-vector simulation. Where entanglement is limited, tensor-network contraction may suit a stage better. Which one applies depends on the structure of the circuit.
Two further questions shape the decision. How much does noise matter for this stage? See noise and error. And how many samples are needed to read it out? See measurement and sampling. The placement is revisited when either answer changes.
Limits and where it sits
Placed is a concept, not a finding. The desk has not recorded a result showing that one placement beats another, and this note does not claim one. A placement is only as good as the cost statements behind it. Those can be wrong.
The idea sits beside hybrid execution, which describes how classical and quantum parts are run together. Placed is the earlier question of which part goes where. The wider catalogue is in the portfolio.
Finding from this desk
Placement is a decision, not a side effect. The Systems desk treats it as a step in its own right, made from stated costs. This note sets out the arrangement. It records no measured result.