Kevin C. Smith
@_quks_
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Postdoctoral researcher in quantum computing at Yale/Brookhaven/Co-design Center for Quantum Advantage (C2QA)
New Haven, CT
Joined February 2022
Happy to see this out!.
An efficient and practical protocol to prepare certain matrix product states using measurements and feedforward operations. @_quks_ @C2QAdvantage . Article: Synopsis:
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RT @zlatko_minev: Starting soon at noon (ET):.Speeding up state preparation with dynamic quantum circuits with Kevin Smith (Yale University….
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Thanks also to co-authors Steve Girvin, Tzu-Chieh Wei and Bryan Clark, as well as everyone who I have discussed this work with over the past year.
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We also provide specific conditions that an MPS must satisfy to be preparable with our scheme. Special shoutout to co-first author Abid Khan for helping me figure all of this out, and for teaching me a lot of group theory along the way.
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Here, we extend this idea to a diverse family of MPS that includes both short- and long-range entangled states, families of symmetry-protected topological and symmetry-broken states, resource states for MBQC, states with non-Abelian symmetries, and more.
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We build upon our previous work where we showed that the paradigmatic AKLT state could be prepared in constant-depth with an adaptive quantum circuit.
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New paper!. We show that a broad class of matrix product states can be exactly prepared using constant-depth quantum circuits with mid-circuit measurements and feedforward. This beats out the fastest possible preparation with unitary circuits alone.
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A full interactive tutorial is included on the Bosonic Qiskit Github with many more details:
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Curious about bosonic error correction? Check out our blog post (led by the very talented Zixiong Liu) where we demonstrate the binomial kitten code in Bosonic Qiskit!.
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RT @Patrick__Winkel: Happy and proud to announce that our paper on the "Dual-rail encoding with superconducting cavities" is now published….
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A more in-depth summary:
Excited to share our new work:. We show (w/ experiments included!) that the AKLT state can be deterministically prepared with a constant-depth circuit + mid-circuit measurements, a major speed-up over known methods that all require times that scale w size.
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Excited to see this appear in PRX Quantum! . We show that the AKLT state -- a prototypical example of a matrix product state and a SPT phase -- can be prepared in constant depth by using midcircuit measurements and feedforward.
A class of symmetry-protected topological states relevant for measurement-based quantum computation is shown to be constructible using only constant-depth quantum circuits by leveraging symmetries, midcircuit measurements, and feed forward. @_quks_.
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RT @C2QAdvantage: It's Quantum Thursday! Today (4/13) at 12 PM ET, @BrookhavenLab Research Associate Kevin Smith presents: "Using measureme….
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We have also added a new tutorial over at the Github repo that walks through the examples in detail:.
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Check out our new blog post on Bosonic Qiskit, an extension to @qiskit developed within @C2QAdvantage that allows you to simulate bosonic modes alongside qubits. Lots of worked examples included!.
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RT @_arXiv_quant_ph: [2211.09116] V. V. Sivak, A. Eickbusch, B. Royer et al.: Real-time quantum error correction beyond break-even https://….
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RT @jaygambetta: Then, Kevin Smith, from @Yale_QI , showed us how to use mid-circuit measurements and feedforward to prepare the AKLT state….
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S/o to coauthors Ella Crane, Nathan Wiebe, and Steve Girvin. It was a lot of fun working on this with all of them.
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In addition to measurements of string order and entanglement spectra, we also carry out a quantum teleportation protocol using AKLT states prepared with our measurement-assisted algorithm.
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