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Physics

Quantum information science

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Displaying 1 - 25 of 948

Electrical interconnects for silicon spin qubits

February 2, 2026
Author(s)
Christopher White, Anthony Sigillito, Michael Gullans
Scalable spin qubit devices will likely require long-range qubit interconnects. We propose to create such an interconnect with a resistive topgate. The topgate is positively biased, to form a channel between the two dots; an end-to-end voltage difference

Bootstrapping, autonomous testing, and initialization system for Si/Si$_x$Ge$_1-x}$ multi-quantum-dot devices

January 20, 2026
Author(s)
Tyler Kovach, Daniel Schug, Michael Wolfe, Evan MacQuarrie, Patrick Walsh, Jared Benson, Mark Friesen, Mark Eriksson, Justyna Zwolak
Semiconductor quantum dot (QD) devices have become central to advancements in spin-based quantum computing. However, the increasing complexity of modern QD devices makes calibration and control---particularly at elevated temperatures---a bottleneck to

Chirped magneto-optical trap of molybdenum

December 12, 2025
Author(s)
Sai Naga Manoj Paladugu, Nickolas Pilgram, Stephen Eckel, Eric Norrgard
We have directly loaded a cryogenic beam of molybdenum atoms into a magneto-optical trap. By chirping the detuning of the trapping lasers, we were able to enhance the number of atoms loaded into the trap by more than a factor of 2. We optimize the trapped

Observation of a fault tolerance threshold with concatenated codes

December 9, 2025
Author(s)
Grace Sommers, Michael Foss-Feig, David Hayes, David Huse, Michael Gullans
We introduce a fault-tolerant protocol for code concatenation using a butterfly network architecture with high noise thresholds and low ancilla overhead to allow implementation on current devices. We develop a probability passing decoder using tensor

Broadband pulsed quadrature measurements with calorimeters

December 8, 2025
Author(s)
Ezad Shojaee, James R. van Meter, Karl Mayer, Scott Glancy, Emanuel Knill
A general one-dimensional quantum optical mode is described by a shape in the time or frequency domain. A fundamental problem is to measure a quadrature operator of such a mode. If the shape is narrow in frequency this can be done by pulsed homodyne

Argon-Ion Treatment of Multi-Material Layered Surface-Electrode Traps for Noise Mitigation

November 28, 2025
Author(s)
Dustin Hite, Tobias Schaetz, Deviprasath Palani, Florian Hasse, Philip Kiefer, Frederick Bockling, Daniel Stick, Ulrich Warring
Electric-field noise near ion-trap electrodes limits motional coherence and represents a key obstacle to scaling trapped-ion quantum systems. Here, we investigate how in situ Ar+ sputtering modifies motional heating and dephasing in multi-material surface

Robust Two-Qubit Geometric Phase Gates using Amplitude and Frequency Ramping

November 18, 2025
Author(s)
Christina Bowers, Deviprasath Palani, John Barta, Tyler Guglielmo, Stephen Libby, Dietrich Leibfried, Daniel Slichter
We demonstrate a method for generating entanglement between trapped atomic ions based on adiabatically ramped state-dependent forces. By ramping both the amplitude of the state-dependent force and the motional mode frequencies, we realize an entangling

Towards a quantum repeater using a surface-trap-integrated microcavity and trapped ions

November 18, 2025
Author(s)
Lindsay Sonderhouse, Margaret Bruff, Kaitlyn David, Daniel Slichter, Dietrich Leibfried
Trapped ions are a leading candidate for the "stationary qubits" of a quantum network. However, thus far remote entanglement rates have primarily been limited by low photon collection efficiency. In this work, we propose an architecture for a long-range

Compatibility of trapped ions and dielectrics at cryogenic temperatures

November 17, 2025
Author(s)
Margaret Bruff, Lindsay Sonderhouse, Kaitlyn David, Daniel Slichter, Dietrich Leibfried, Jules Stuart
We study the impact of an unshielded dielectric\textemdash here, a bare optical fiber\textemdash on a $^40}$Ca$^+}$ ion held several hundred $\mu$m away in a cryogenic surface electrode trap. We observe distance-dependent stray electric fields of up to a

Single-photon time-of-flight measurements for benchmarking time transfer in quantum networks

November 14, 2025
Author(s)
Dongxing He, Paulina Kuo, YaShian Li-Baboud, Anouar Rahmouni, Matthew Shaw, Boris Korzh, Thomas Gerrits
We propose a single-photon time-of-flight (ToF) measurement method to benchmark fiber-path delay estimation in optical two-way time and frequency transfer (OTWTFT) protocols. The single-photon ToF measurement yields uncertainties better than 2 ps (0.5 mm

A fault-tolerant neutral-atom architecture for universal quantum computation

November 10, 2025
Author(s)
Dolev Bluvstein, Alexandra Geim, Sophie Li, Simon Evered, J. Pablo Bonilla Ataides, Gefen Baranes, Andi Gu, Tom Manovitz, Muqing Xu, Marcin Kalinowski, Shayan Majidy, Christian Kokail, Nishad Maskara, Elias C Trapp, Luke Stewart, Simon Hollerith, Hengyun Zhou, Michael Gullans, Susanne Yelin, Markus Greiner, Vladan Vuletic, Madelyn Cain, Mikhail Lukin
Quantum error correction (QEC) is believed to be essential for the realization of large-scale quantum computers. However, due to the complexity of operating on the encoded 'logical' qubits, understanding the physical principles for building fault-tolerant

Unraveling spin entanglement using quantum gates with scanning tunneling microscopy-driven electron spin resonance

October 31, 2025
Author(s)
Eric Switzer, Jose Reina Galvez, Geza Giedke, Talat Rahman, Christoph Wolf, Deung-Jang Choi, Nicolas Lorente
Quantum entanglement is a fundamental resource for quantum information processing, and its controlled generation and detection remain key challenges in scalable quantum architectures. Here, we demonstrate the deterministic generation of entangled spin

Temperature-Compensated Multi-Level CMOS Modulators Operating from 10 K to 300 K for Cryogenic Interconnects

October 14, 2025
Author(s)
Christopher Kniss, Abhishek Sharma, Ratanak Phon, Gregory Shimon, Eran Socher, Pragya Shrestha, Karthick Ramu, Jason Campbell, Amin Pourvali, Richard Al Hadi, Yanghyo Kim
This work presents temperature-compensated cryogenic CMOS modulators operating over a 10-300 K temperature range, suitable for intra- and inter-thermal cryogenic communications. Conventional metal-based coax cables suffer from a fundamental trade-off

Scalable and fault-tolerant preparation of encoded k-uniform states

October 3, 2025
Author(s)
Shayan Majidy, Dominik Hangleiter, Michael Gullans
k-uniform states are valuable resources in quantum information, enabling tasks such as teleporta- tion, error correction, and accelerated quantum simulations. However, verifying k-uniformity is as difficult as measuring code distances, and devising fault

Efficient production of sodium Bose-Einstein condensates in a hybrid trap

September 10, 2025
Author(s)
Ian Spielman, Stephen Eckel, Gretchen Campbell, Yanda Geng, Shouvikl Mukherjee, Swarnav Banik, Monica Gutierrez~Galan, Hector Sosa-Martinez, Madison Anderson
We describe an apparatus that efficiently produces $^23}$Na Bose-Einstein condensates (BECs) in a hybrid trap that combines a quadrupole magnetic field with a far-detuned optical dipole trap. Using a Bayesian optimization framework, we systematically

Accurate Unsupervised Photon Counting from Transition Edge Sensor Signals

September 5, 2025
Author(s)
Nicolas Dalbec-Constant, Guillaume Thekkadath, Duncan England, Thomas Gerrits, Nicolas Quesada
We compare methods for signal classification applied to voltage traces from transition edge sensors (TES) which are photon-number resolving detectors fundamental for accessing quantum advantages in information processing, communication and metrology. We

BenchQC: A Benchmarking Toolkit for Quantum Computation

August 4, 2025
Author(s)
Nia Rodney-Pollard, Kamal Choudhary
The Variational Quantum Eigensolver (VQE) is a widely studied hybrid classical-quantum algorithm for approximating ground-state energies in molecular and materials systems. This study benchmarks the performance of the VQE for calculating ground-state
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