SpinHex: A low-crosstalk, spin-qubit architecture based on multi-electron couplers

• URL: http://arxiv.org/abs/2504.03149v1
• Date: Fri, 04 Apr 2025 04:04:01 GMT
• Title: SpinHex: A low-crosstalk, spin-qubit architecture based on multi-electron couplers
• Authors: Rubén M. Otxoa, Josu Etxezarreta Martinez, Paul Schnabl, Normann Mertig, Charles Smith, Frederico Martins,
• Abstract summary: We propose a spin-qubit architecture based on spinless multielectron quantum dots that act as low-crosstalk couplers between a two-dimensional arrangement of spin-qubits in a hexagonal lattice.<n>The multielectron couplers are controlled by voltage signals, which mediate fast Heisenberg exchange and thus enable coherent multi-qubit operations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Semiconductor spin qubits are an attractive quantum computing platform that offers long qubit coherence times and compatibility with existing semiconductor fabrication technology for scale up. Here, we propose a spin-qubit architecture based on spinless multielectron quantum dots that act as low-crosstalk couplers between a two-dimensional arrangement of spin-qubits in a hexagonal lattice. The multielectron couplers are controlled by voltage signals, which mediate fast Heisenberg exchange and thus enable coherent multi-qubit operations. For the proposed architecture, we discuss the implementation of the rotated XZZX surface code and numerically study its performance for a circuit-level noise model. We predict a threshold of $0.18\%$ for the error rate of the entangling gates. We further evaluate the scalability of the proposed architecture and predict the need for $4480$ physical qubits per logical qubit with logical error rates of $10^{-12}$ considering entangling gate fidelities of $99.99\%$, resulting in a chip size of $2.6$cm$^2$ to host $10,000$ logical qubits.

Related papers

• Performance Characterization of a Multi-Module Quantum Processor with Static Inter-Chip Couplers [63.42120407991982]
  Three-dimensional integration technologies such as flip-chip bonding are a key prerequisite to realize large-scale superconducting quantum processors.<n>We present a design for a multi-chip module comprising one carrier chip and four qubit modules.<n>Measuring two of the qubits, we analyze the readout performance, finding a mean three-level state-assignment error of $9 times 10-3$ in 200 ns.<n>We demonstrate a controlled-Z two-qubit gate in 100 ns with an error of $7 times 10-3$ extracted from interleaved randomized benchmarking.
  arXiv  Detail & Related papers  (2025-03-16T18:32:44Z)
• Experimental realization of direct entangling gates between dual-type qubits [2.8241239147294883]
  We demonstrate a direct entangling gate between dual-type qubits encoded in the $S_1/2$ and $D_5/2$ hyperfine equations of $137mathrmBa+$ ions. We achieve a Bell state fidelity of $96.3(4)%$ for the dual-type Molmer-Sorensen gate between an $S$-$D$ ion pair, comparable to that for the same-type $S$-$S$ or $D$-$D$ gates. This technique can reduce the overhead for back-
  arXiv  Detail & Related papers  (2024-10-08T03:18:29Z)
• Modular quantum processor with an all-to-all reconfigurable router [34.39074227074929]
  We propose a high-speed on-chip quantum processor that supports reconfigurable all-to-all coupling with a large on-off ratio. We demonstrate reconfigurable controlled-Z gates across all qubit pairs, with a benchmarked average fidelity of $96.00%pm0.08%$. We also generate multi-qubit entanglement, distributed across the separate modules, demonstrating GHZ-3 and GHZ-4 states with fidelities of $88.15%pm0.24%$ and $75.18%pm0.11%$, respectively.
  arXiv  Detail & Related papers  (2024-07-29T16:02:03Z)
• Parametric multi-element coupling architecture for coherent and dissipative control of superconducting qubits [0.0]
  We present a superconducting qubit architecture based on tunable parametric interactions to perform two-qubit gates, reset, leakage recovery and to read out the qubits. We experimentally demonstrate a controlled-Z gate with a fidelity of $98.30pm 0.23 %$, a reset operation that unconditionally prepares the qubit ground state with a fidelity of $99.80pm 0.02 %$ and a leakage recovery operation with a $98.5pm 0.3 %$ success probability.
  arXiv  Detail & Related papers  (2024-03-04T16:49:36Z)
• Towards large-scale quantum optimization solvers with few qubits [59.63282173947468]
  We introduce a variational quantum solver for optimizations over $m=mathcalO(nk)$ binary variables using only $n$ qubits, with tunable $k>1$. We analytically prove that the specific qubit-efficient encoding brings in a super-polynomial mitigation of barren plateaus as a built-in feature.
  arXiv  Detail & Related papers  (2024-01-17T18:59:38Z)
• Robust shaped pulses for arrays of superconducting or semiconductor spin qubits with fixed Ising coupling [0.0]
  A major current challenge in solid-state quantum computing is to scale qubit arrays to a larger number of qubits. One approach to simplifying the problem is to use a qubit array with fixed Ising ($ZZ$) interactions. We construct this set of robust gates for two-edge, three-edge, and four-edge vertices, which compose all existing superconducting qubit and semiconductor spin qubit arrays.
  arXiv  Detail & Related papers  (2023-10-24T20:05:47Z)
• 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)
• Realization of arbitrary doubly-controlled quantum phase gates [62.997667081978825]
  We introduce a high-fidelity gate set inspired by a proposal for near-term quantum advantage in optimization problems. By orchestrating coherent, multi-level control over three transmon qutrits, we synthesize a family of deterministic, continuous-angle quantum phase gates acting in the natural three-qubit computational basis.
  arXiv  Detail & Related papers  (2021-08-03T17:49:09Z)
• Crosstalk analysis for single-qubit and two-qubit gates in spin qubit arrays [0.0]
  scaling up spin qubit systems requires high-fidelity single-qubit and two-qubit gates. We analyze qubit fidelities impacted by crosstalk when performing single-qubit and two-qubit operations on neighbor qubits.
  arXiv  Detail & Related papers  (2021-05-21T09:16:36Z)
• Conditional quantum operation of two exchange-coupled single-donor spin qubits in a MOS-compatible silicon device [48.7576911714538]
  Silicon nanoelectronic devices can host single-qubit quantum logic operations with fidelity better than 99.9%. For the spins of an electron bound to a single donor atom, introduced in the silicon by ion implantation, the quantum information can be stored for nearly 1 second. Here we demonstrate the conditional, coherent control of an electron spin qubit in an exchange-coupled pair of $31$P donors implanted in silicon.
  arXiv  Detail & Related papers  (2020-06-08T11:25:16Z)

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.