4 papers
Counting single-qubit Clifford equivalent graph states is #P-Complete
Axel Dahlberg, Jonas Helsen, Stephanie Wehner
Graph states, which include for example Bell states, GHZ states and cluster states, form a well-known class of quantum states with applications ranging from quantum networks to err…
The complexity of the vertex-minor problem
Axel Dahlberg, Jonas Helsen, Stephanie Wehner
A graph H is a vertex-minor of a graph G if it can be reached from G by the successive application of local complementations and vertex deletions. Vertex-minors have been the subje…
Spectral Quantum Tomography
Jonas Helsen, Francesco Battistel, Barbara M. Terhal
We introduce spectral quantum tomography, a simple method to extract the eigenvalues of a noisy few-qubit gate, represented by a trace-preserving superoperator, in a SPAM-resistant…
Benchmarking Gate Fidelities in a Si/SiGe Two-Qubit Device
X. Xue, T. F. Watson, J. Helsen +7
We report the first complete characterization of single-qubit and two-qubit gate fidelities in silicon-based spin qubits, including cross-talk and error correlations between the tw…