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Bulletin of the American Physical Society

Preparation of a narrowband, itinerant microwave qubit for quantum information transfer

Xizheng Ma, Adam Reed, Lucas R. Sletten, Matthew J. Reagor, Luke Burkhart, Wolfgang Pfaff, Robert J. Schoelkopf, Konrad W. Lehnert

Published Mar 15, 2016• 0 citations
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We theoretically demonstrate dynamically selective directional emission and absorption of a single itinerant microwave photon in a waveguide. The proposed device is an artificial molecule composed of two qubits coupled to a waveguide a quarter wavelength apart. By using simulations based on the input-output theory, we show that, upon preparing an appropriate entangled state of the two qubits, a photon is emitted directionally as a result of the destructive interference occurring either at the right or left of the qubits. Moreover, we demonstrate that this artificial molecule possesses the capability of absorbing and transmitting an incoming photon on demand, a feature essential to the creation of a fully interconnected one-dimensional quantum network, in which quantum information can be exchanged between any two given nodes.
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Abstract Surface acoustic waves are commonly used in classical electronics applications, and their use in quantum systems is beginning to be explored, as evidenced by recent experiments using acoustic Fabry–Pérot resonators. Here we explore their use for quantum communication, where we demonstrate a single-phonon surface acoustic wave transmission line, which links two physically separated qubit nodes. Each node comprises a microwave phonon transducer, an externally controlled superconducting variable coupler, and a superconducting qubit. Using this system, precisely shaped individual itinerant phonons are used to coherently transfer quantum information between the two physically distinct quantum nodes, enabling the high-fidelity node-to-node transfer of quantum states as well as the generation of a two-node Bell state. We further explore the dispersive interactions between an itinerant phonon emitted from one node and interacting with the superconducting qubit in the remote node. The observed interactions between the phonon and the remote qubit promise future quantum-optics-style experiments with itinerant phonons.