Add ibm yorktown qft5 example

.gitignore

@@ -12,3 +12,4 @@ leapex/
 leapex-reoptimize/
 multistart/
 docs/_build/
+qft5-yorktown/

examples/qft5_ibm_yorktown.py

@@ -0,0 +1,28 @@
+"""
+This example synthesizes a 5 qubit Quantum Fourier Transform for the IBM Yorktown
+quantum computer.
+"""
+from qsearch import (
+    gates, unitaries, Project,
+    leap_compiler, post_processing,
+    parallelizers, multistart_solvers,
+    gatesets, assemblers,
+)
+
+if __name__ == '__main__':
+    with Project('qft5-yorktown') as project:
+            # Add a 5 qubit qft
+            project.add_compilation("qft5", unitaries.qft(32))
+            # configure qsearch to use the LEAP compiler, which scales to more qubits
+            project["compiler_class"] = leap_compiler.LeapCompiler
+            # set a miniumum search depth (to reduce frequent chopping that gets nowhere)
+            project["min_depth"] = 3
+            # use the IBM yorktown "bowtie" topology
+            project["gateset"] = gatesets.QubitCNOTAdjacencyList([(0,1),(0,2),(1,2),(2,3),(2,4),(3,4)])
+            # give verbose output to track the synthesis
+            project["verbosity"] = 2
+            # run synthesis
+            project.run()
+            # LEAP generates sub-optimal results, so we must re-synthesize to get the best results
+            project.post_process(post_processing.LEAPReoptimizing_PostProcessor(), solver=multistart_solvers.MultiStart_Solver(24), parallelizer=parallelizers.ProcessPoolParallelizer, weight_limit=5)
+            project.assemble("qft5", assembler=assemblers.ASSEMBLER_IBMOPENQASM)