Papers
Characterization of Radiation-Induced Errors in Superconducting Qubits Protected with Various Gap-Engineering Strategies
H. Douglas Pinckney, Thomas McJunkin, Alan W. Hunt +26 more·Mar 13, 2026
Impacts from high-energy particles cause correlated errors in superconducting qubits by increasing the quasiparticle density in the vicinity of the Josephson junctions (JJs). Such errors are particularly harmful as they cannot be easily remedied via ...
Universal monitored dynamics in multimode bosonic systems
Shivam Patel, Catherine McCarthy, Ahana Chakraborty +5 more·Mar 13, 2026
We propose a route to study monitored many-body dynamics in multimode bosonic systems using circuit quantum electrodynamics. In this experimental setting, we construct several bosonic models comprising brickwork circuits built from beam-splitter gate...
On-Demand Correlated Errors in Superconducting Qubits from a Particle Accelerator
Thomas McJunkin, A. W. Hunt, Yenuel Jones-Alberty +9 more·Mar 13, 2026
Ionizing radiation is a known source of correlated errors in superconducting quantum processors, inhibiting the functionality of quantum error correction surface codes. High-energy photons and charged particles deposit pair-breaking energy into these...
Experimental realization of a $\cos(2\varphi)$ transmon qubit
Erwan Roverc'h, Alvise Borgognoni, Marius Villiers +7 more·Mar 13, 2026
Superconducting circuits with embedded symmetries are good candidates to robustly protect quantum information from dominant error channels. The $\cos(2\varphi)$ qubit, consisting of an island shunted to ground through a tunneling element that selecti...
Noise-protected two-qubit gate using anisotropic exchange interaction
Zizheng Wu, Maximilian Rimbach-Russ·Mar 13, 2026
Hole spin qubits hosted in Germanium quantum dots are promising candidates for scalable quantum computing. The strong spin-orbit interaction can enable fast and all-electrical quantum control. Furthermore, the platform can implement universal quantum...
Critical behaviors of magic and participation entropy at measurement induced phase transitions
Eliot Heinrich, Hanchen Liu, Tianci Zhou +1 more·Mar 13, 2026
We study the participation and stabilizer entropy of non-unitary quantum circuit dynamics, focusing on the critical line that separates the low-entanglement spin-glass phase and the paramagnetic phase. Along this critical line, the entanglement has a...
Doppler-induced tunable and shape-preserving frequency conversion of microwave wave packets
Felix Ahrens, Enrico Bogoni, Renato Mezzena +7 more·Mar 12, 2026
In superconducting electronics, the ability to control the frequency of microwave wave packets is crucial for several applications, such as the operation of superconducting quantum processors and the readout of superconducting sensors. We introduce a...
Thermalisation as Diffusion in Hilbert Space
Aleksey Lunkin·Mar 12, 2026
We develop a microscopic theory of thermalisation for a thermometer coupled to a many-body bath beyond standard Markovian and Fermi-golden-rule assumptions. By modeling interaction matrix elements in the non-interacting basis as independent random va...
Optimal control with flag qubits
Liang-Xu Xie, Lui Zuccherelli de Paula, Weizhou Cai +6 more·Mar 12, 2026
High-fidelity quantum operations are the cornerstone of fault-tolerant quantum computation. In open quantum systems, traditional optimal control only passively resists decoherence, leaving environment-induced uncertainty as a fundamental performance ...
Measurement-Induced State transitions in Inductively-Shunted Transmons
Nicholas Zobrist, John Mark Kreikebaum, Mostafa Khezri +6 more·Mar 12, 2026
Fast and high-fidelity qubit measurement plays a key role in quantum error correction. In superconducting qubits, measurement is typically performed using a resonant microwave drive on a readout resonator dispersively coupled to the qubit. Shorter me...
All-electrostatic valley qubit gates in tilted Dirac-Weyl semimetals
Can Yesilyurt·Mar 12, 2026
Valley degrees of freedom in tilted Dirac materials offer a route toward fully electrical quantum control, but previous electrostatic barrier schemes have used the valley index only as a classical filtering resource. Here, we show that a smooth elect...
Quantum Reservoir Autoencoder for Blind Decryption: Two-Phase Protocol and Noise Resilience
Hikaru Wakaura, Taiki Tanimae·Mar 12, 2026
We instantiate the quantum reservoir autoencoder (QRA) with a noise-induced reservoir employing reset noise channels and address two open problems: noise-resilient reversibility and blind decryption. For a single-ciphertext protocol with 10 data qubi...
Saturable absorption in diamond nanophotonics
Christopher Coutts, Nicholas J. Sorensen, Elham Zohari +3 more·Mar 11, 2026
Diamond is a leading quantum photonics platform due to its ability to host qubits based on crystal defects such as nitrogen vacancy centres. Fabricating nanophotonic devices from defect-rich diamond, which is central to many quantum sensing technolog...
Mitigating crosstalk errors for simultaneous single-qubit gates on a superconducting quantum processor
Jaap J. Wesdorp, Eric Hyyppä, Joona Andersson +61 more·Mar 11, 2026
Single-qubit gates on superconducting quantum processors are typically implemented using microwave pulses applied through dedicated control lines. However, these microwave pulses may also drive other qubits due to crosstalk arising from capacitive co...
Supercurrents in Josephson junctions with chiral molecular potentials
Oleg Kuliashov, Alberto Cappellaro, Oded Millo +3 more·Mar 11, 2026
The influence of chiral molecular potentials on phase-coherent transport in superconducting Josephson junctions is investigated. Within a Bogoliubov-de Gennes tight-binding framework, an SNS junction functionalized by adsorbed chiral molecules is mod...
Dissipation- versus Chaos-Induced Relaxation in Non-Markovian Quantum Many-Body Systems
Gabriel Almeida, Pedro Ribeiro, Masudul Haque +1 more·Mar 11, 2026
In interacting quantum many-body systems, relaxation toward equilibrium reflects a competition between internal chaotic dynamics and environmental dissipation. While conventional Markovian baths typically produce exponential decay, non-Markovian diss...
Universal purification dynamics in real non-unitary quantum processes
Federico Gerbino, Donghoon Kim, Guido Giachetti +2 more·Mar 11, 2026
We study purification dynamics in monitored quantum processes governed by ensembles of quantum circuits in different random-matrix symmetry classes. We analyze the universal aspects that emerge away from the measurement induced phase transition and i...
Efficient and accurate two-qubit-gate operation in a high-connectivity transmon lattice utilizing a tunable coupling to a shared mode
Tuure Orell, Hao Hsu, Joona Andersson +3 more·Mar 11, 2026
Increasing connectivity and decreasing qubit-state delocalization without compromising the speed and accuracy of elementary gate operations are topical challenges in the development of large-scale superconducting quantum computers. In this theoretica...
Entanglement distribution among distinct mechanical nodes in a quantum network
Zhi-Yuan Fan, Liu-Yong Cheng·Mar 11, 2026
We propose two schemes to achieve remote entanglement distribution between two mechanical nodes with a significant frequency mismatch, based on optomechanical systems. The first scheme utilizes the physical mechanism to redistribute the quantum entan...
Light-Matter Interactions Beyond the Dipole Approximation in Extended Systems Without Multipole Expansion
Rishabh Dora, Roman Korol, Vishal Tiwari +2 more·Mar 10, 2026
We present a general theoretical framework to capture light-matter interactions beyond the electric-dipole approximation (EDA), applicable to extended nano- and microscale materials interacting with spatially structured electric fields without trunca...