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Quantum Bath Engineering with Superconducting Qubits
Irfan Siddiqi, University of California, Berkeley
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Uncontrolled interaction with a noisy environment typically results in decoherence processes that suppress quantum behavior, and typically drive a system of quantum bits toward their ground state. We consider the case of superconducting transmon qubits coupled to microwave frequency cavities, with the latter providing both a channel for quantum state readout and a dynamic quantum bath which can be configured through the application of microwave irradiation. With appropriately chosen drive pulses and readout protocols, we show that such an environment can mediate autonomous cooling to both superposition and entangled states for up to three qubits coupled to a single cavity, and two qubits in separate cavities connected by a coaxial cable. We discuss the fidelity of these operations and routes for future optimization.