The Quantum Socket and DemuXYZ-Based Gates with Superconducting Qubits

• URL: http://arxiv.org/abs/2211.00143v1
• Date: Mon, 31 Oct 2022 21:06:04 GMT
• Title: The Quantum Socket and DemuXYZ-Based Gates with Superconducting Qubits
• Authors: J.H. B\'ejanin, C.T. Earnest, and M. Mariantoni
• Abstract summary: We exercise the quantum socket using high-coherence flux-able Xmon transmon qubits. We propose and experimentally characterize a demultiplexed gate technique based on flux pulses and a common continuous drive signal: DemuXYZ.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Building large-scale superconducting quantum computers requires two complimentary elements: scalable wiring techniques and multiplex architectures. In our previous work [B\'ejanin et al., Phys. Rev. Applied 6, 044010 (2016)], we have introduced and characterized a truly vertical interconnect named the quantum socket. In this paper, we exercise the quantum socket using high-coherence flux-tunable Xmon transmon qubits. In particular, we test potential qubit heating and one-qubit gate performance. We observe no heating effects and time-stable gate fidelities in excess of 99.9%. We then propose and experimentally characterize a demultiplexed gate technique based on flux pulses and a common continuous drive signal: DemuXYZ. We discuss DemuXYZ's working principle, show its operation, and perform quantum process tomography on a selection of one-qubit gates to confirm proper operation. We obtain fidelities around 93% likely limited by flux-pulse imperfections. We finally discuss future solutions for wiring integration as well as improvements to the DemuXYZ technique.

Related papers

• Above 99.9% Fidelity Single-Qubit Gates, Two-Qubit Gates, and Readout in a Single Superconducting Quantum Device [58.154405222706146]
  tuning of qubit-coupler coupling strengths in a superconducting circuit with two transmon qubits coupled via a tunable coupler enables high-fidelity single- and two-qubit gates.<n>We achieve a 40h-averaged CZ gate fidelity of 99.93%, simultaneous single-qubit gate fidelities of 99.98%, and readout fidelities over 99.94% in a single device.
  arXiv  Detail & Related papers  (2025-08-22T14:49:47Z)
• A Superconducting Qubit-Resonator Quantum Processor with Effective All-to-All Connectivity [44.72199649564072]
  This architecture can be used as a test-bed for algorithms that benefit from high connectivity. We show that the central resonator can be used as a computational element. We achieve a genuinely multi-qubit entangled Greenberger-Horne-Zeilinger (GHZ) state over all six qubits with a readout-error mitigated fidelity of $0.86$.
  arXiv  Detail & Related papers  (2025-03-13T21:36:18Z)
• Realization of two-qubit gates and multi-body entanglement states in an asymmetric superconducting circuits [3.9488862168263412]
  We propose a tunable fluxonium-transmon-transmon (FTT) cou pling scheme. The asymmetric structure composed of fluxonium and transmon will optimize the frequency space and form a high fidelity two-qubit quantum gate. We study the performance of this scheme by simulating the general single-qubit Xpi/2 gate and two-qubit (iSWAP) gate.
  arXiv  Detail & Related papers  (2024-04-12T08:44:21Z)
• Optimal control in large open quantum systems: the case of transmon readout and reset [44.99833362998488]
  We present a framework that combines the adjoint-state method together with reverse-time backpropagation to solve prohibitively large open-system quantum control problems. We apply this framework to optimize two inherently dissipative operations in superconducting qubits. Our results show that while standard pulses for dispersive readout are nearly optimal, adding a transmon drive during the protocol can yield 2x improvements in fidelity and duration.
  arXiv  Detail & Related papers  (2024-03-21T18:12:51Z)
• High-fidelity parallel entangling gates on a neutral atom quantum computer [41.74498230885008]
  We report the realization of two-qubit entangling gates with 99.5% fidelity on up to 60 atoms in parallel. These advances lay the groundwork for large-scale implementation of quantum algorithms, error-corrected circuits, and digital simulations.
  arXiv  Detail & Related papers  (2023-04-11T18:00:04Z)
• Generation of perfectly entangled two and three qubits states by classical random interaction [0.0]
  This study examines the possibility of finding perfect entanglers for a Hamiltonian. In this study, we use a superconducting circuit that stands out from other quantum-computing devices. Our scheme could contribute to quantum teleportation, quantum communication, and some other areas of quantum information processing.
  arXiv  Detail & Related papers  (2022-12-06T16:27:58Z)
• First design of a superconducting qubit for the QUB-IT experiment [50.591267188664666]
  The goal of the QUB-IT project is to realize an itinerant single-photon counter exploiting Quantum Non Demolition (QND) measurements and entangled qubits. We present the design and simulation of the first superconducting device consisting of a transmon qubit coupled to a resonator using Qiskit-Metal.
  arXiv  Detail & Related papers  (2022-07-18T07:05:10Z)
• Two-qubit gate in neutral atoms using transitionless quantum driving [0.0]
  A neutral-atom system serves as a promising platform for realizing gate-based quantum computing. The two-qubit entangling gate fidelity lags behind competing platforms such as superconducting systems and trapped ions. We propose a fast, robust, high-fidelity controlled-Z gate, based on the Rydberg-blockade mechanism, for neutral atoms.
  arXiv  Detail & Related papers  (2022-06-17T17:51:49Z)
• High fidelity two-qubit gates on fluxoniums using a tunable coupler [47.187609203210705]
  Superconducting fluxonium qubits provide a promising alternative to transmons on the path toward large-scale quantum computing. A major challenge for multi-qubit fluxonium devices is the experimental demonstration of a scalable crosstalk-free multi-qubit architecture. Here, we present a two-qubit fluxonium-based quantum processor with a tunable coupler element.
  arXiv  Detail & Related papers  (2022-03-30T13:44:52Z)
• Unimon qubit [42.83899285555746]
  Superconducting qubits are one of the most promising candidates to implement quantum computers. Here, we introduce and demonstrate a superconducting-qubit type, the unimon, which combines the desired properties of high non-linearity, full insensitivity to dc charge noise, insensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator.
  arXiv  Detail & Related papers  (2022-03-11T12:57:43Z)
• Interactive Protocols for Classically-Verifiable Quantum Advantage [46.093185827838035]
  "Interactions" between a prover and a verifier can bridge the gap between verifiability and implementation. We demonstrate the first implementation of an interactive quantum advantage protocol, using an ion trap quantum computer.
  arXiv  Detail & Related papers  (2021-12-09T19:00:00Z)
• Quantum control landscape for ultrafast generation of single-qubit phase shift quantum gates [68.8204255655161]
  We consider the problem of ultrafast controlled generation of single-qubit phase shift quantum gates. Globally optimal control is a control which realizes the gate with maximal possible fidelity. Trap is a control which is optimal only locally but not globally.
  arXiv  Detail & Related papers  (2021-04-26T16:38:43Z)
• Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation [44.07593636917153]
  Quantum computers based on solid state qubits have been a subject of rapid development in recent years. Currently, each quantum device is controlled and characterised though a dedicated signal line between room temperature and base temperature of a dilution refrigerator. This approach is not scalable and is currently limiting the development of large-scale quantum system integration and quantum device characterisation.
  arXiv  Detail & Related papers  (2020-11-23T16:22:15Z)
• Nonadiabatic geometric quantum computation with optimal control on superconducting circuits [7.703593898562321]
  We propose a nonadiabatic geometric quantum computation scheme on superconducting circuits. Our scheme provides a promising step towards fault-tolerant solid-state quantum computation.
  arXiv  Detail & Related papers  (2020-04-21T08:34:08Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.