Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session A28: Recent Advances in Quantum Error CorrectionInvited Live Streamed
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Sponsoring Units: DQI Chair: Jahan Claes Room: McCormick Place W-190A |
Monday, March 14, 2022 8:00AM - 8:36AM |
A28.00001: Co-designing Quantum Error Correction and Near-Term Hardware Invited Speaker: Natalie C Brown Time constraints are important to consider within any paradigm of quantum computing. Algorithms should be executed quickly and efficiently; within the coherence window of the qubits. Implementing algorithms on real hardware consists of several primitives including gates, cooling and possibly transport steps, depending on the hardware implementation, all of which have temporal overhead. Executing these operations too slowly can result in errors and possibly complete decoherence of the qubits. Executing these primitives too quickly leaves little room for the feed-forward controls necessary for most quantum error correction protocols. Thus a compromise should exist between speed and latency, utilizing time for efficiency. In this talk, I will discuss this balancing act and explore how the Honeywell System Model H1 quantum computer leverages time to implement crucial features of quantum error correction, including real-time corrections and decoding. |
Monday, March 14, 2022 8:36AM - 9:12AM |
A28.00002: Recent developments in LDPC quantum codes Invited Speaker: Nikolas P Breuckmann Quantum error correction is an indispensable ingredient for scalable quantum computing. We discuss a particular class of quantum codes called "quantum low-density parity-check (LDPC) codes." The codes we discuss are alternatives to the surface code, which is currently the leading candidate to implement quantum fault tolerance. We discuss the zoo of quantum LDPC codes and discuss their potential for making quantum computers robust with regard to noise. In particular, we explain recent advances in the theory of quantum LDPC codes related to certain product constructions and discuss open problems in the field. |
Monday, March 14, 2022 9:12AM - 9:48AM |
A28.00003: Quantum error correction on a superconducting system with heavy hexagon topology Invited Speaker: Maika Takita Superconducting qubit based systems have made tremendous strides in device performance, from improved coherences to lowered single- and two-qubit gate errors, and high-fidelity mid-circuit measurements and qubit resets. In this talk, I will present recent progress towards fault tolerant quantum error correction on superconducting qubit systems, that leverages the resources from improved device performance. I will focus on experimental demonstrations on a heavy-hexagon topology, an arrangement that reduces lattice connectivity compared to other popular low-degree parity-check codes in order to mitigate cross-talk between fixed-frequency transmon qubits. I will describe some of the encoding, syndrome extraction, and decoding operations that can be tailored to this topology, focusing on d = 2 and 3 codes. The code design, along with the current level of hardware noise, place this system in a very favorable path for the coming years in the quest for scalable, fault-tolerant quantum error correction. Our results and preliminary simulations highlight not only the versatility and flexibility of the underlying heavy-hexagon topology, but also the importance of tailoring a decoder when implementing these protocols. |
Monday, March 14, 2022 9:48AM - 10:24AM |
A28.00004: Macroscopic bit-flip times in a superconducting cat-qubit Invited Speaker: Zaki Leghtas A quantum system interacts with its environment -- if ever so slightly -- no matter how much care is put into isolating it. Therefore, quantum bits undergo errors, putting dauntingly difficult constraints on the hardware suitable for quantum computation. In this talk I will describe an emerging qubit that we have coined the cat-qubit. Quantum information is encoded in the field quadrature space of a superconducting resonator endowed with a special mechanism that dissipates photons in pairs. This process pins down two computational states to separate locations in phase space. The underlying premise is that bit-flips are exponentially suppressed as this separation is increased, and therefore only phase-flips remain to be corrected via a one-dimensional quantum error correction code. In this talk I will describe our recent progress towards the protection of quantum information in cat-qubits. |
Monday, March 14, 2022 10:24AM - 11:00AM |
A28.00005: Estimating overheads for quantum fault-tolerance in the honeycomb code Invited Speaker: Michael Newman The honeycomb code is an exciting new quantum error-correcting code on which the logical observables dance around periodically. This dance permits logical qubits embedded naturally in a sparse qubit lattice, with check operators that are constructed from products of anticommuting weight-two measurements. However, these experimentally amenable properties come at an error-corrective cost. In this talk, we'll discuss estimates for the overhead of quantum error-correction using the honeycomb code, and compare it with the popular surface code. We'll touch on different metrics for comparing the two, as well as the (mostly open-source) software that greatly simplified these comparisons. |
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