Quantum gates

The development of a functional, large scale fault-tolerant quantum computer based on the gate model faces a scalability challenge: Controlling and error-correcting the evolution of a large number of qubits (>100). In this context, one must be able to execute single- and two-qubit gates rapidly and with high fidelity while simultaneously keeping a low level of crosstalk.

In our group, we use analytical techniques to find time-dependent control fields that realize a time-dependent Hamiltonian fully compatible with experimental constraints on available interactions and their tunability. The control fields are chosen such that the unitary evolution generated by the Hamiltonian yields a desired gate.

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