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- W4301406062 abstract "Phonons, the ubiquitous quanta of vibrational energy, play a vital role in the performance of many quantum technologies. Coupling to well-defined phonon modes allows for highly-connected multi-qubit gates in ion trap architectures as well as the generation of entangled states in systems of superconducting qubits. Even when the phonons take the form of a large dissipative bath, an irreversible flow of heat allows for state initialization critical to the function of laser systems and the operation of optically active spin qubits. Conversely, unintended coupling to phonons has been shown to degrade qubit performance by generating decohering quasiparticles and leading to correlated errors in superconducting qubit systems. Regardless of whether a phononic bath plays an enabling or deleterious role, it is typically intrinsic to the system and does not admit specific control over its spectral properties, nor the possibility of engineering aspects of its dissipation to be used as a resource. Here we show that by precisely designing and controlling the coupling of a superconducting qubit to phononic degrees of freedom allows a new type of quantum control over superconducting circuits. By shaping the loss spectrum of the qubit via its coupling to a bath of lossy piezoelectric surface acoustic wave phonons, we are able to prepare and stabilize arbitrary qubit states. Additionally, we find that the presence of the energy-dependent loss imparted onto the qubit by the phonons is well-described by a master equation treatment of the composite system, with excellent agreement in both the qubit dynamics as well as its steady state. Our results demonstrate the ability of engineered phononic dissipation to achieve highly efficient qubit control." @default.
- W4301406062 created "2022-10-05" @default.
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- W4301406062 date "2022-08-15" @default.
- W4301406062 modified "2023-09-23" @default.
- W4301406062 title "Phononic bath engineering of a superconducting qubit" @default.
- W4301406062 doi "https://doi.org/10.48550/arxiv.2208.07423" @default.
- W4301406062 hasPublicationYear "2022" @default.
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