QPU usage time dependency on circuit depth and overhead processes

QPU usage time dependency on circuit depth and overhead processes Ask Question Asked 3 days ago Modified today Viewed 28 times 2 The issue is the QPU usage time on IBM machines. Let me describe the problem. I have a small circuit to manipulate 3 qubits (it is an optimization problem and I don't think the details are relevant, but can be provided if needed).  This circuit is ran for 8 initial configurations (000, 001,...,111) and the results are measured. This process takes around 5-6 s of QPU time for 2000 shots on an IBM open-instance machine (ibm_fez in this case), which I think is a lot. So, first question: is this really a lot or my expectation is wrong? Then I noticed that the transpiled circuit  has around 120 layers and the reason is that the gates in the original circuit are not native for IBM. Therefore, the original circuit was mapped to use the native gates, resulting in a transpiled circuit of around 13 layers. However, the QPU execution time hasn't changed at all. Second question: was it correct to expect a change in execution time by reducing the number of layers by a factor 10x? Third and final question: Are there any any over-heading processes in IBM machines that are so large that in fact kill any optimization in the circuits for small problems or my code is so wrong and inefficient that any real machine will struggle to run it? Hope the problem statement and questions are clear, but please ask question if not. qiskitquantum-circuitoptimizationhardware Share Improve this question Follow edited 10 hours ago asked Mar 13 at 16:35 Filipe FB 212 2 bronze badges New contributor Add a comment Know someone who can answer? Share a link to this question via email, Twitter, or Facebook. Your Answer Sign up or log in Sign up using Google Sign up using Email and Password Post as a guest Name Email Required, but never shown Post Your Answer By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. Start asking to get answers Find the answer to your question by asking. Ask question Explore related questions qiskitquantum-circuitoptimizationhardware See similar questions with these tags. The Overflow Blog Open source for awkward robots Domain expertise still wanted: the latest trends in AI-assisted knowledge for... Featured on Meta Logo updates to Stack Overflow's visual identity Related 1 An effective way to submit all the jobs for VQE/QAOA at a time to an IBMQ machine? 5 Reasonable Circuit Depth 1 What is the minimal set of gates to transpile any quantum circuit to minimal depth? Hot Network Questions What does "day" mean in Job 1:4? Why are dialetheias sometimes described as “nondualisms”? 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