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Search Publications

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Displaying 1 - 25 of 963

Analog quantum simulator of a quantum field theory with fermion-spin systems in silicon

May 29, 2026
Author(s)
Ali Rad, Alexander Schuckert, Eleanor Crane, Gautam Nambiar, Fan Fei, Jonathan Wyrick, Richard Silver, Mohammad Hafezi, Zohreh Davoudi, Michael Gullans
Simulating fermions coupled to large spin degrees of freedom represents a promising application for quantum simulators, given its relevance to lattice gauge theories. Mapping fermions to qubits is challenging in dimensions larger than one, complicating the

Quantum non-Markovian noise in randomized benchmarking of spin-boson models

April 24, 2026
Author(s)
Srilekha Gandhari, Michael Gullans
In non-Markovian systems, the current state of the system depends on the full or partial history of its past evolution. Owing to these time correlations, non-Markovian noise violates common assumptions in gate characterization protocols such as randomized

Domain-engineered, aperiodically-poled KTiOPO4 for polarization-entangled photons

April 20, 2026
Author(s)
Paulina Kuo, Sesha Challa, Anouar Rahmouni, Dileep Venkatarama Reddy, Ori Levin, Noa Bloch
We demonstrate a high-quality source of polarization-entangled photons in aperiodically-poled KTiOPO_4 (KTP). The crystal is based on a phase-modulated domain-engineered design that allows two simultaneous downconversion processes, where the two processes

Impact of Measurement Setup on Cryogenic CMOS FET Characterization

March 31, 2026
Author(s)
Pragya Shrestha, Jason Campbell, Jhih-Wei Chen, Mau-Chung Frank Chang
Accurate cryogenic device characterization is essential for developing compact models to support scalable quantum control electronics based on advanced CMOS nodes. However, we show that abnormal I–V characteristics observed in 16 nm and 28 nm devices at

Robust phase stabilization of a dark quantum channel over a 120 km deployed fiber link

March 12, 2026
Author(s)
Daehyun Ahn, Ivan Burenkov, Jabir Marakkarakath Vadakkepurayil, Mheni Merzouki, Paulina Kuo, Abdella Battou, Thomas Gerrits, Sergey Polyakov
We present a scalable solution for phase stabilization of dark metropolitan-scale fiber links using wavelength division multiplexing (WDM). We implement a combined feed-back and feed-forward phase stabilization for a target channel by combining error

Low-frequency cryocoolers are compressed inefficiently

March 10, 2026
Author(s)
Ryan Snodgrass, Vincent Kotsubo, Jens Hoehne, Joel Ullom
Millikelvin refrigerators are enabling tools for many fields of modern science, including quantum information processing. They are typically precooled to 4 K by low-frequency pulse-tube refrigerators, which perform a thermodynamic cycle based on

QDFlow: A Python package for physics simulations of quantum dot devices

March 3, 2026
Author(s)
Donovan Buterakos, Sandesh Kalantre, Joshua Ziegler, Jacob Taylor, Justyna Zwolak
Recent advances in machine learning (ML) have accelerated progress in calibrating and operating quantum dot (QD) devices. However, most ML approaches rely on access to large, representative datasets designed to capture the full spectrum of data quality

Localized quasiparticles in a quasi-two-dimensional fluxonium

February 21, 2026
Author(s)
Trevyn Larson, Sarah Jones, Tamas Kalmar, Pablo Aramburu Sanchez, Sai Pavan Chitta, Varun Verma, Kristen Genter, Katarina Cicak, Sae Woo Nam, Gergo Fulop, Jens Koch, Raymond Simmonds, Andras Gyenis
Disordered superconducting materials with high kinetic inductance are an important resource for generating nonlinearity in quantum circuits and creating high-impedance environments. In thin films fabricated from these materials, the combination of disorder

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
Displaying 1 - 25 of 963
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