Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session U03: Recent Progress with Gottesman-Kitaev-Preskill States for Quantum Information ProcessingInvited Live
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Chair: Steven Girvin, Yale |
Thursday, June 3, 2021 2:00PM - 2:30PM Live |
U03.00001: Robust Encoding of a Qubit in a Molecule Invited Speaker: Victor V Albert We construct quantum error-correcting codes that embed a finite-dimensional code space in the infinite-dimensional Hilbert space of rotational states of a rigid body. These codes, which protect against both drift in the body's orientation and small changes in its angular momentum, may be well suited for robust storage and coherent processing of quantum information using rotational states of a polyatomic molecule. Extensions of such codes to rigid bodies with a symmetry axis are compatible with rotational states of diatomic molecules as well as nuclear states of molecules and atoms. We also describe codes associated with general non-Abelian groups and develop orthogonality relations for coset spaces, laying the groundwork for quantum information processing with exotic configuration spaces. |
Thursday, June 3, 2021 2:30PM - 3:00PM Live |
U03.00002: Error correction of a logical GKP qubit using engineered dissipation Invited Speaker: Jonathan P Home Quantum error correction is expected to play an important role in the realization of large-scale quantum computers. At the lowest level, it takes advantage of embedding qubits in a larger Hilbert space, giving redundancy which allows measurements which preserve logical information while revealing the presence of errors. While many codes rely on multiple physical systems, Bosonic codes make use of the higher dimensional Hilbert space of a single harmonic oscillator mode. A powerful Bosonic code is the GKP code proposed in 2001, which uses non-local "grid" states to protect information from small displacements of an oscillator. I will describe experiments in which we encode, measure and perform quantum error correction on an encoded logical GKP qubit, using the motion of a trapped ion coupled by laser light to an electronic ancilla qubit. We introduce a measurement approach for the finite-energy GKP code which can realize high fidelity qubit readout, and use this to construct a dissipative map which performs error correction, achieving an extension of logical coherence across all logical axes of more than three. I will also show how these techniques are related laser cooling, offering a particularly efficient means of entropy extraction from the oscillator via a single spin. |
Thursday, June 3, 2021 3:00PM - 3:30PM On Demand |
U03.00003: Advances in Scalability and Fault Tolerance for Bosonic Quantum Computing Invited Speaker: Nicolas Menicucci Optical quantum computing offers the tantalising promise of room-temperature quantum computation and vast scalability, while bosonic modes in circuit QED have proven to be more robust to noise than the more traditional information carriers, the transmon qubits. Advances like these suggest that bosonic modes may be the best substrate for a quantum computer. Quantum computing with bosonic systems has advanced far beyond its single-photon origins to encompass more robust and interesting states of light that serve as quantum information carriers with built-in resilience to decoherence. These so-called bosonic codes, when combined with a demonstrably scalable architecture like a continuous-variable cluster state, bring fault-tolerant quantum computing with bosonic systems within reach. The missing pieces are high enough squeezing in laboratory experiments and efficient use of the available resources. In this talk, I will give an overview of recent key advances in scalability and fault tolerance for quantum computing with bosonic modes. |
Thursday, June 3, 2021 3:30PM - 4:00PM Live |
U03.00004: Autonomous Stabilization of Finite-energy Gottesman-Kitaev-Preskill States Invited Speaker: Baptiste Royer Bosonic error-correction codes are emerging as an attractive and hardware-efficient alternative to qubit-based encodings. In particular, the Gottesman-Kitaev-Preskill (GKP) code has been shown in simulations to protect logical information better than other known bosonic codes against typical error channels. However, in their ideal form, GKP codewords contain an infinite amount of energy, making the stabilization of their realistic, finite-energy version challenging. More specifically, stabilization strategies for GKP states need to take into account the amount of energy injected at each error-correction step. |
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