Kavli Affiliate: Oskar Painter
| First 5 Authors: Mohammad Mirhosseini, Alp Sipahigil, Mahmoud Kalaee, Oskar Painter,
| Summary:
Bidirectional conversion of electrical and optical signals lies at the
foundation of the global internet. Such converters are employed at repeater
stations to extend the reach of long-haul fiber optic communication systems and
within data centers to exchange high-speed optical signals between computers.
Likewise, coherent microwave-to-optical conversion of single photons would
enable the exchange of quantum states between remotely connected
superconducting quantum processors, a promising quantum computing hardware
platform. Despite the prospects of quantum networking, maintaining the fragile
quantum state in such a conversion process with superconducting qubits has
remained elusive. Here we demonstrate the conversion of a microwave-frequency
excitation of a superconducting transmon qubit into an optical photon. We
achieve this using an intermediary nanomechanical resonator which converts the
electrical excitation of the qubit into a single phonon by means of a
piezoelectric interaction, and subsequently converts the phonon to an optical
photon via radiation pressure. We demonstrate optical photon generation from
the qubit with a signal-to-noise greater than unity by recording quantum Rabi
oscillations of the qubit through single-photon detection of the emitted light
over an optical fiber. With proposed improvements in the device and external
measurement set-up, such quantum transducers may lead to practical devices
capable of realizing new hybrid quantum networks, and ultimately, distributed
quantum computers.
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