2018/12/31 by P. M. Harrington, Mahdi Naghiloo, M. Naghiloo +3 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Condensed matter physics #Optoelectronics #Phase qubit #Photonic and Optical Devices #Photonic crystal #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Quantum state #Qubit #Transmon #cond-mat.mes-hall #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physreva.99.052126
published as Phys. Rev. A 99, 052126 (2019) · 9 pages 7 figures
openalex created_date 2018/12/22 · arxiv created 2019/04/29 · openalex publication_date 2019/05/28 · arxiv updated 2019/06/05 · openalex updated_date 2026/08/06
We demonstrate how the dissipative interaction between a superconducting qubit and a microwave photonic crystal can be used for quantum bath engineering. The photonic crystal is created with a step-impedance transmission line which suppresses and enhances the quantum spectral density of states, influencing decay transitions of a transmon circuit. The qubit interacts with the transmission line indirectly via dispersive coupling to a cavity. We characterize the photonic crystal density of states from both the unitary and dissipative dynamics of the qubit. When the qubit is driven, it dissipates into the frequency dependent density of states of the photonic crystal. Our result is the deterministic preparation of qubit superposition states as the steady state of coherent driving and dissipation near the photonic crystal band edge, which we characterize with quantum state tomography. Our results highlight how the multimode environment from the photonic crystal forms a resource for quantum control.