Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K75: Superconducting Qubits: Cat Qubits and Strong CouplingFocus
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Sponsoring Units: DQI Chair: Chen Wang, University of Massachusetts Amherst Room: Room 401/402 |
Tuesday, March 7, 2023 3:00PM - 3:36PM |
K75.00001: Single electron spin resonance by microwave photon counting Invited Speaker: Emmanuel Flurin
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Tuesday, March 7, 2023 3:36PM - 3:48PM |
K75.00002: Single-Photon Subtraction in Circuit QED Christopher McNally, Max Hays, William D Oliver Single-photon subtraction (SPS) is a quantum control primitive that transfers a single excitation from a bosonic oscillator to a coupled two-level system, furnishing a means to coherently test the occupancy predicate ???>?0. We investigate how SPS might be implemented in circuit quantum electrodynamics (cQED), a relatively mature technology with native oscillators and controllable two-level systems. In cQED, application of linear microwave drives provides universal control of a coupled resonator-qubit system. As such, an SPS control protocol could in principle be implemented via optimal control techniques; however, we are given no promises about the protocol speed/fidelity tradeoff or its interpretability. We propose principled methods to deterministically and coherently transfer a single microwave photon from a superconducting resonator to a transmon qubit, and compare these with known techniques in the optical domain. We discuss steps to implement SPS with existing cQED technology, as well as applications to NISQ quantum algorithms. |
Tuesday, March 7, 2023 3:48PM - 4:00PM |
K75.00003: Progress on 3D qudit architecture with high-coherence SRF cavities David van Zanten, Taeyoon Kim, Tanay Roy, Silvia Zorzetti, Matthew J Reagor, Mustafa Bal, Roman Pilipenko, Shaojiang Zhu, Srivatsan Chakram, Alexander Romanenko, Anna Grassellino Superconducting radio frequency (SRF) cavities are excellent choices for storing quantum information as quantum d-level systems (qudits) due to their exceptionally long lifetimes and large accessible Hilbert spaces. A common strategy to manipulate the states is to use a nonlinear element like a transmon. There are however several challenges to build a 3D SRF architecture while maintaining a seconds long cavity lifetime. In this presentation, we demonstrate successful integration of superconducting qubits made by Rigetti with single-cell Nb SRF cavities. We discuss the experimental results with different approaches like photon-blockade and selective number dependent arbitrary phase gates to prepare non-classical states. Finally, we discuss our strategies to improve the coherence times and extend the system for building a multi-qudit quantum processor. |
Tuesday, March 7, 2023 4:00PM - 4:12PM |
K75.00004: Enhancing the cat's lifetime by squeezing Xiaozhou Pan, Jonathan Schwinger, Ni-Ni Huang, Pengtao Song, Yifan Li, Fernando Valadares, Atharv Joshi, Wei Pin Chua, Fumiya Hanamura, Yvonne Y Gao Cat states, which span high-dimensional Hilbert space, have been proven to be an attractive candidate for redundantly encoding in superconducting circuit quantum electrodynamics [1]. Usually, such cat states are easily affected by photon loss, which inevitably leads to the degradation of the encoded quantum information [2]. One promising technique to protect the quantum coherence of cat states is quadrature squeezing [3]. Here, we generate a squeezed cat state in a three-dimensional microwave cavity via a deterministic protocol, which consist of conditional displacements and qubit rotations. We show that squeezing enhances the coherence of cat states against photon loss [4]. This demonstration provides a useful technique to create more robust code words for quantum error correction and paves the way for robust information processing using bosonic states in superconducting cavities. |
Tuesday, March 7, 2023 4:12PM - 4:24PM |
K75.00005: Adiabatic Fock state generation and faithful Wigner tomography in a Kerr nonlinear resonator Shiori Fujii, Daisuke Iyama, Takahiko Kamiya, Sangil Kwon, Shohei Watabe, Jiao-Jiao Xue, Jaw-Shen Tsai Fock states are the simplest and the most well-known nonclassical states of light. Despite its fundamental and practical importance, generation of Fock state is a challenging task because we do not have means to control the levels of a linear quantum oscillator selectively without an additional nonlinear system. |
Tuesday, March 7, 2023 4:24PM - 4:36PM |
K75.00006: Fast Cat State Generation Using a Kerr Parametric Oscillator Daisuke Iyama, Shiori Fujii, Takahiko Kamiya, Sangil Kwon, Shohei Watabe, Jiao-Jiao Xue, Jaw-Shen Tsai The cat code have been considered as a promising encoding scheme for practical bosonic quantum computation. |
Tuesday, March 7, 2023 4:36PM - 4:48PM |
K75.00007: Experimental universal gate set operation on cat qubits in a Kerr Parametric Oscillator Takahiko Kamiya, Daisuke Iyama, Shiori Fujii, Sangil Kwon, Shohei Watabe, Jaw-Shen Tsai We present our experimental results on implementation of universal gate set operation on cat states encoding. These cat states are generated in two-dimensional superconducting Kerr Parametric Oscillators (KPOs). X- and Z-gates are implemented by manipulating the strength of the microwave drive and its detuning. Numerical optimization technics are applied to improve the gate fidelity, which is estimated using quantum process tomography. We also show some preliminary results of two-KPO gate operation. This work will be the first step towards realization of a universal quantum computing platform made of a nonlinear oscillator network [1]. |
Tuesday, March 7, 2023 4:48PM - 5:00PM |
K75.00008: Towards a bias-preserving CNOT gate between stabilized cat qubits (Part 1) Antoine Essig, Nicolas Bourdaud, Joachim Cohen, Nathanael P Cottet, Louise Devanz, Pierre FEVRIER, Antoine Gras, Jérémie Guillaud, Efe Gümüs, Mattis Hallén, Venus Hasanuzzaman Kamrul, Sebastion Jezouin, Raphael Lescanne, Paul Magnard, Julien Roul, Natalia Pankratova, Felix Rautschke, Theau Peronnin, Erwan Roverc'h, Jeremy Stevens, Stephane Polis, Jean-Loup Ville, Pierre Wan-Fat, Rémi Rousseau Bosonic codes enable hardware-efficient quantum error correction by exploiting the infinite-dimensional Hilbert space of a quantum harmonic oscillator to implement some of the required redundancy for error correction. Autonomously stabilized cat qubits have demonstrated an exponential suppression of bit-flips errors with the average number of photons of the cat states, at the cost of a linear increase of phase-flips. This results in a strong noise-bias that reduces the hardware requirements for further error correction. However, leveraging this first error protection layer requires that all quantum gates preserve the error-bias. Concretely, applying a gate should produce bit-flip errors that are also exponentially suppressed with the cat state photon number. One gate of central importance is the CNOT gate that is used to measure the error syndrome of the repetition code considered to correct the remaining phase-flips errors. |
Tuesday, March 7, 2023 5:00PM - 5:12PM |
K75.00009: Towards a bias-preserving CNOT gate between stabilized cat qubits (Part 2) Nathanael P Cottet, Nicolas Bourdaud, Joachim Cohen, Louise Devanz, Antoine Essig, Pierre FEVRIER, Antoine Gras, Jérémie Guillaud, Efe Gümüs, Mattis Hallén, Venus Hasanuzzaman Kamrul, Sebastien Jezouin, Raphael Lescanne, Paul Magnard, Natalia Pankratova, Theau Peronnin, Stephane Polis, Julien Roul, Felix Rautschke, Rémi Rousseau, Erwan Roverc'h, Jeremy Stevens, Jean-Loup Ville, Pierre Wan-Fat Bosonic codes enable hardware-efficient quantum error correction by exploiting the infinite-dimensional Hilbert space of a quantum harmonic oscillator to implement some of the required redundancy for error correction. Autonomously stabilized cat qubits have demonstrated an exponential suppression of bit-flips errors with the average number of photons of the cat states, at the cost of a linear increase of phase-flips. This results in a strong noise-bias that reduces the hardware requirements for further error correction. However, leveraging this first error protection layer requires that all quantum gates preserve the error-bias. Concretely, applying a gate should produce bit-flip errors that are also exponentially suppressed with the cat state photon number. One gate of central importance is the CNOT gate that is used to measure the error syndrome of the repetition code considered to correct the remaining phase-flips errors. |
Tuesday, March 7, 2023 5:12PM - 5:24PM |
K75.00010: Encoding a cat-qubit in a 3D millisecond lifetime superconducting cavity Ulysse Reglade, Anil Murani, Felix Rautschke, Stephane Polis, Natalia Pankratova, Emanuele Albertinale, Antoine Gras, Theau Peronnin, Phillipe Campagne-Ibarcq, Raphael Lescanne, Sebastien Jezouin, Zaki Leghtas
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Tuesday, March 7, 2023 5:24PM - 5:36PM |
K75.00011: Fast tunable coupling scheme of Kerr parametric oscillators using shortcuts to adiabaticity Shumpei Masuda, Taro Kanao, Hayato Goto, Yuichiro Matsuzaki, Toyofumi Ishikawa, Shiro Kawabata Kerr parametric oscillators (KPOs) implemented with Josephson parametric oscillators can work as qubits and have been attracting much attention in terms of their applications to quantum annealing, universal quantum computation and quantum simulation. It is important for these applications to realize fast and accurate tunable coupling between KPOs in a simple manner. We propose a simple scheme of tunable coupling of KPOs with high tunability in speed and amplitude by using the fast transitionless rotation of a KPO in the phase space based on the counter-diabatic protocol [1]. The scheme of the tunable effective coupling between KPOs can be implemented with always-on linear coupling between KPOs, by modulating the phase of the pump field and the resonance frequency of the KPO. We apply the coupling scheme to a two-qubit gate, and show that our scheme realizes higher gate fidelity than a purely adiabatic one, by decreasing detrimental nonadiabatic transitions. |
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