arXiv subjects

M. J. Weaver

Publications and source records attributed to M. J. Weaver.

3 recordsLinked to original sources

arXiv2025

Optical readout of a superconducting qubit using a piezo-optomechanical transducer

Superconducting quantum processors have made significant progress in size and computing potential. However, the practical cryogenic limitations of operating large numbers of superconducting qubits are becoming a bottleneck for further scaling. Due to the low thermal conductivity and the dense optical multiplexing capacity of telecommunications fiber, converting qubit signal processing to the optical domain using microwave-to-optics transduction would significantly relax the strain on cryogenic space and thermal budgets. Here, we demonstrate optical readout of a superconducting transmon qubit through an optical fiber connected via a coaxial cable to a fully integrated piezo-optomechanical transducer. Using a demolition readout technique, we achieve a single shot readout fidelity of 81%. Our results illustrate the benefits of piezo-optomechanical transduction for low-dissipation operation of large quantum processors.

quant-ph↗

arXiv2025

Scalable Quantum Computing with Optical Links

Quantum computers have great potential to solve problems which are intractable on classical computers. However, quantum processors have not yet reached the required scale to run applications which outperform traditional computers. Leading hardware platforms, such as superconducting qubit based processors, will soon become bottlenecked by the physical constraints of their low temperature environments, and the expansion of quantum computers will necessitate quantum links between multiple processor modules. Optical frequencies offer the most promising path for these links due to their resilience to noise even at ambient temperature and the maturity of classical optical networks. However, required microwave-to-optics transducers cannot operate deterministically yet, which has widely been seen as a key challenge for their integration into fault-tolerant quantum computers. In this work, we examine implementations of optical links between cryogenic units that surpass the performance of individual cryogenic modules even with the performance of existing or near-term microwave-to-optics transducers. We show methods for these transducers to provide on-demand entanglement between separated quantum processors with high fidelity and lay out key steps for adoption of the technology including scaling transducer numbers and integration with other hardware. Finally, we discuss a number of architectures comprised of these links which can drive the expansion of quantum data centers to utility scale.

quant-ph↗

arXiv2016

Optomechanics with a polarization non-degenerate cavity

Experiments in the field of optomechanics do not yet fully exploit the photon polarization degree of freedom. Here experimental results for an optomechanical interaction in a polarization nondegenerate system are presented and schemes are proposed for how to use this interaction to perform accurate side-band thermometry and to create novel forms of photon-phonon entanglement. The experimental system utilizes the compressive force in the mirror attached to a mechanical resonator to create a micro-mirror with two radii of curvature which leads, when combined with a second mirror, to a significant polarization splitting of the cavity modes.

quant-ph↗