Kaufman Group News

High-fidelity gates and creation of entangled states in Yb171 nuclear-spin qubits

Steven Burrows — Sun, 22 Mar 2026 18:17:50 +0000

High-fidelity gates and creation of entangled states in Yb171 nuclear-spin qubits Steven Burrows Sun, 03/22/2026 - 12:17

Our paper on preparing entangled states in Yb171 has been accepted in Nature physics! Congratulations to the team! We show high-fidelity gates in the metastable qubit, high-fidelity three-outcome measurements, and coherent mapping of entangled states between the Rydberg, nuclear, and optical qubits. This work suggests several new directions, including in quantum error correction, hybrid digital-analog quantum simulations, and quantum metrology.

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New proposal for using quantum error correction in metrology

Steven Burrows — Sun, 22 Mar 2026 18:16:31 +0000

New proposal for using quantum error correction in metrology Steven Burrows Sun, 03/22/2026 - 12:16

In quantum metrology, it has been considered for some time whether quantum error correction can be used to enhance precision measurements. Here, the primary challenge is devising codes ad protocols that correct noise while not correcting the unknown signal being sensed. In this collaboration with the Pichler, we identify some promising conditions for leveraging quantum error correction for enhanced sensing, even when signal and noise couple identically to sensor qubits.

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Assembling a superfluid from individual atoms

Steven Burrows — Sun, 22 Mar 2026 18:14:16 +0000

Assembling a superfluid from individual atoms Steven Burrows Sun, 03/22/2026 - 12:14

Since it was first proposed in 2004 by David Weiss and Maxim Olshanii, it has been a goal to see whether atomic rearrangement and high-fidelity ground-state laser cooling could employed to prepare superfluids and low-entropy many-body states of itinerant matter. In this work, we demonstrate such a protocol, opening a new path to assembling ground-state many-body state of bosonic and fermionic quantum systems.

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Cryogenic optical tweezer array

Steven Burrows — Wed, 28 May 2025 19:39:20 +0000

Cryogenic optical tweezer array Steven Burrows Wed, 05/28/2025 - 13:39

Our work on high optical access cryogenic system for Rydberg atoms has been published in PRX Quantum - see this viewpoint on our studies.

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Enhanced Rydberg dressing paper published!

Steven Burrows — Sun, 27 Apr 2025 17:32:36 +0000

Enhanced Rydberg dressing paper published! Steven Burrows Sun, 04/27/2025 - 11:32

We used features of alkaline-earth atoms to enhance the timescale coherent many-body physics using Rydberg-dressing, which enables studies of quantum magnetism and the creation of metrologically-useful entanglement. See the paper here.

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Our paper on boson sampling with atoms has been published!

Steven Burrows — Thu, 09 May 2024 17:35:27 +0000

Our paper on boson sampling with atoms has been published! Steven Burrows Thu, 05/09/2024 - 11:35

We recently demonstrated a new architecture for programmable control of Hubbard systems of neutral atoms. Here we used this platform to prepare and control systems of up to 180 particles. We study how their dynamics realize the boson sampling problem, originally formulated for photonics. You can read more about here. Congratulations to the team!!

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Aaron graduated!

Steven Burrows — Fri, 26 Apr 2024 17:39:09 +0000

Aaron graduated! Steven Burrows Fri, 04/26/2024 - 11:39

After ~six very productive years, Aaron defended and graduated (on Nov. 1, 2023)! Congratulations Dr. Young! We are sad to see you go but very excited for your next adventure in the Greiner group!

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Our realization of the omg-architecture in 171Yb is published in PRX!

Steven Burrows — Fri, 26 Apr 2024 17:37:38 +0000

Our realization of the omg-architecture in 171Yb is published in PRX! Steven Burrows Fri, 04/26/2024 - 11:37

Our paper demonstrating the omg-architecture and mid-circuit operations in Ytterbium-171 has been published in PRX. Congratulations to the team!

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Our squeezing paper is published in nature!

Steven Burrows — Wed, 30 Aug 2023 17:40:15 +0000

Our squeezing paper is published in nature! Steven Burrows Wed, 08/30/2023 - 11:40

Our paper reporting squeezing below the standard quantum limit in a programmable atom array has been published in nature! Congratulations to the team! Exciting to co-publish with the Browaeys/Yao and Roos/Rey teams too!

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Our recent manuscripts from the Strontium experiment have been published!

Steven Burrows — Tue, 30 Aug 2022 17:41:39 +0000

Our recent manuscripts from the Strontium experiment have been published! Steven Burrows Tue, 08/30/2022 - 11:41

Our recent manuscripts on tweezer programmable quantum walks and optical clock Bell states were published in Science and Nature Physics. You can read more about these experiments here.

Both of these experiments relied on some new technology we developed for interfacing optical tweezer arrays and optical lattices. This approach was recently highlight here, in a piece by Giulia Semeghini.

Our recent manuscripts on tweezer programmable quantum walks and optical clock Bell states were published in Science and Nature Physics. Both of these experiments relied on some new technology we developed for interfacing optical tweezer arrays and optical lattices.

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