A. Grassellino

Microwave dielectric properties of LiNbO $_{3}$ and AlN at millikelvin temperatures and single-photon power

Alessandro Reineri, Francesco Crisa, Akshay Murthy +8

Efficient bidirectional microwave-optical photon conversion is a key capability for scaling superconducting quantum processors into distributed networks. However, achieving the nec…

Architectural scaling tradeoffs in modular 3D bosonic quantum processors

Shaojiang Zhu, Ugur Alyanak, Tanay Roy +7

We propose a modular three-dimensional bosonic quantum processor built from repeatable coupled-cavity modules linked by configurable interconnect networks. Using hardware-motivated…

Oxide-Nitride Heteroepitaxy for Low-Loss Dielectrics in Superconducting Quantum Circuits

David A. Garcia-Wetten, Mitchell J. Walker, Peter G. Lim +9

Superconducting qubits show great promise for the realization of fault-tolerant quantum computing, but lossy, amorphous dielectrics limit current technology. Identifying highly cry…

Two-Level System Spectroscopy from Correlated Multilevel Relaxation in Superconducting Qubits

Tanay Roy, Xinyuan You, David van Zanten +5

Transmon qubits are a cornerstone of modern superconducting quantum computing platforms. Temporal fluctuations of energy relaxation in these qubits are widely attributed to microsc…

Two-tooth bosonic quantum comb for temporal-correlation sensing

Shaojiang Zhu, Xinyuan You, Alexander Romanenko +1

We characterize the causal structure of coherence transport in open bosonic systems using a two-tooth quantum comb. We show that, by mapping sequential interactions between a struc…

A Cryogenic Muon Tagging System Based on Kinetic Inductance Detectors for Superconducting Quantum Processors

Ambra Mariani, Laura Cardani, Mustafa Bal +16

Ionizing radiation has emerged as a potential limiting factor for superconducting quantum processors, inducing quasiparticle bursts and correlated errors that challenge fault-toler…

Efficient Floating-Point Arithmetic on Fault-Tolerant Quantum Computers

José E. Cruz Serrallés, Oluwadara Ogunkoya, Do{g}a Murat Kürkçüo{g}lu +5

We propose a novel floating-point encoding scheme that builds on prior work involving fixed-point encodings. We encode floating-point numbers using Two's Complement fixed-point man…

Coherence-Mediated Quantum Thermometry in a Hybrid Circuit-QED Architecture

Shaojiang Zhu, Xinyuan You, Alexander Romanenko +1

Quantum thermometry plays a critical role in the development of low-temperature sensors and quantum information platforms. In this work, we propose and theoretically analyze a hybr…

Analysis of RF Surface Loss in a Planar 2D Qubit

Andrei Lunin, Mustafa Bal, Akshay Murthy +3

The Josephson junction and shunt capacitor form a transmon qubit, which is the cornerstone of modern quantum computing platforms. For reliable quantum computing, it is important ho…

Squeezing enhanced sensing at an exceptional point

Changqing Wang, Deyuan Hu, Silvia Zorzetti +3

Pushing the boundaries of measurement precision is central for sensing and metrology, pursued by nonclassical resources such as squeezing, and non-Hermitian degeneracies with disti…

Demonstrating magnetic field robustness and reducing temporal T1 noise in transmon qubits through magnetic field engineering

Bektur Abdisatarov, Tanay Roy, Daniel Bafia +10

The coherence of superconducting transmon qubits is often disrupted by fluctuations in the energy relaxation time (T1), limiting their performance for quantum computing. While back…

Ultracoherent superconducting cavity-based multiqudit platform with error-resilient control

Taeyoon Kim, Tanay Roy, Xinyuan You +26

Realizing the promise of quantum computing requires simultaneously increasing Hilbert-space size and coherence times. While qubit-based architectures have long been the dominant pa…

Floquet-engineered fast SNAP gates in weakly coupled circuit-QED systems

Xinyuan You, Andy C. Y. Li, Tanay Roy +5

Superconducting cavities with high quality factors, coupled to a fixed-frequency transmon, provide a state-of-the-art platform for quantum information storage and manipulation. The…