Noise-protected two-qubit gate using anisotropic exchange interaction

• URL: http://arxiv.org/abs/2603.13039v1
• Date: Fri, 13 Mar 2026 14:48:25 GMT
• Title: Noise-protected two-qubit gate using anisotropic exchange interaction
• Abstract summary: Hole spin qubits hosted in Germanium quantum dots are promising candidates for scalable quantum computing.<n>We propose a novel two-qubit gate protocol for Germanium hole spin qubits operated in the gapless regime.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Hole spin qubits hosted in Germanium quantum dots are promising candidates for scalable quantum computing. The strong spin-orbit interaction can enable fast and all-electrical quantum control. Furthermore, the platform can implement universal quantum control using only baseband signals, which may mitigate the impact of crosstalk and microwave-induced heating. At the same time, spin-orbit interaction gives rise to an anisotropic exchange interaction, whose potential for implementing two-qubit gates has remained largely unexplored. However, the current performance of operating a hole-based quantum computer is mostly limited by dephasing due to low-frequency charge noise. In this work, we propose a novel two-qubit gate protocol for Germanium hole spin qubits operated in the gapless regime. This gate protocol exploits the anisotropic exchange interaction between neighboring spins and utilizes a composite pulse scheme implemented solely through electrical baseband signals. Using this approach, we predict high-fidelity two-qubit controlled-Z operations that can suppress exchange-energy fluctuations, offering a pathway toward fault-tolerant semiconductor quantum processors.

Related papers

• Simulation of Two-qubit Gate Variability and Fidelity of Spin Qubits Built on Nanosheet Technology [0.7009487789080343]
  Low fidelity of two-qubit entanglement gates remains a key barrier to large-scale integration.<n>Recent simulations of silicon spin-qubit two-qubit gates have been performed on silicon-on-insulator platforms.<n>Nanosheet-based charge-qubit work has been limited to single-qubit operation.
  arXiv  Detail & Related papers  (2026-06-30T17:55:03Z)
• Robust iSWAP gates for semiconductor spin qubits with local driving [0.0]
  We propose a robust iSWAP gate protocol for semiconductor spin qubits.<n>Our scheme uses only local microwave drives on conventional exchange-coupled spin qubits.
  arXiv  Detail & Related papers  (2025-10-06T03:25:00Z)
• High-fidelity two-qubit gates with transmon qubits using bipolar flux pulses and tunable couplers [25.989599596628693]
  Scheme based on superconducting transmon qubits and control pulse delivery protocol.<n>We demonstrate a high-fidelity two-qubit gate with a performance of $99.5%$.<n>We confirm the scalability potential of the proposed scheme on a high-fidelity 4-qubit quantum processor.
  arXiv  Detail & Related papers  (2025-09-05T09:43:29Z)
• Resonant two-qubit gates for fermionic simulations with spin qubits [0.0]
  We show a method to implement the fSim gate set in spin qubits using a single pulse combining baseband and resonant exchange drives.<n>This approach minimizes gate duration and drive amplitude, mitigating decoherence and crosstalk.<n>Our results establish a practical route toward a versatile and efficient two-qubit gate set for spin-based quantum processors.
  arXiv  Detail & Related papers  (2025-07-18T09:52:12Z)
• Electrically tunable quantum interference of atomic spins on surfaces [43.73138793116028]
  We demonstrate electrical control of quantum interference using atomic spins on an insulating film in a scanning tunneling microscope.<n>We modulate the atomically-confined magnetic interaction between the probe tip and surface atoms with a strong electric field, and drive the spin state rapidly through the energy-level anticrossing.<n>Results open new avenues for all-electrical quantum manipulation in spin-based quantum processors.
  arXiv  Detail & Related papers  (2025-06-01T14:28:36Z)
• Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations [0.0]
  We experimentally optimize the frequency of flux-tunable couplers in a superconducting quantum processor to minimize the impact of spectator transmons.<n>We adapt a popular transmon-like tunable-coupling element, achieving high-fidelity, low-leakage controlled-$Z$ gates with unipolar, fast-adiabatic pulsing only on the coupler.
  arXiv  Detail & Related papers  (2025-03-17T14:41:05Z)
• Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator [42.152052307404]
  We propose a simple scheme to cancel stray interactions between qubits. We numerically show that such a scheme can enable short and high-fidelity entangling gates. Our architecture is not only ZZ free but also contains no extra noisy components.
  arXiv  Detail & Related papers  (2023-11-02T15:42:02Z)
• A SWAP Gate for Spin Qubits in Silicon [5.6151418663848744]
  We show a fast SWAP gate with a duration of 25 ns based on quantum dots in isotopically enriched silicon. We calibrate the single-qubit local phases during the SWAP gate by incorporating single-qubit gates in our circuit. These results pave the way for high fidelity SWAP gates, and processes based on them, such as quantum communication on chip and quantum simulation.
  arXiv  Detail & Related papers  (2023-10-10T15:24:15Z)
• Real-time two-axis control of a spin qubit [23.355961895855337]
  We demonstrate a real-time control protocol for a two-electron singlet-triplet qubit with two fluctuating Hamiltonian parameters. Powered by a field-programmable gate array (FPGA), the quantum control electronics estimates the Overhauser field gradient between the two electrons in real time.
  arXiv  Detail & Related papers  (2023-08-03T20:07:00Z)
• Hybrid Gate-Pulse Model for Variational Quantum Algorithms [33.73469431747376]
  Current quantum programs are mostly compiled on the gate-level, where quantum circuits are composed of quantum gates. pulse-level optimization has gained more attention from researchers due to their advantages in terms of circuit duration. We present a hybrid gate-pulse model that can mitigate these problems.
  arXiv  Detail & Related papers  (2022-12-01T17:06:35Z)
• Nonadiabatic quantum control of quantum dot arrays with fixed exchange using Cartan decomposition [0.0]
  In semiconductor spin qubits, shuttling of spin is a practical way to generate quantum operations between distant qubits. We extend our previous results for double- and triple-dot systems, and describe a method for implementing spin shuttling in long chains of quantum dots in a nonadiabatic manner.
  arXiv  Detail & Related papers  (2022-07-06T01:04:39Z)
• Demonstration of tunable three-body interactions between superconducting qubits [38.98439939494304]
  We present a superconducting circuit architecture in which a coupling module mediates 2-local and 3-local interactions. The 3-local interaction is coherently tunable over several MHz via the coupler flux biases and can be turned off.
  arXiv  Detail & Related papers  (2022-05-09T20:23:43Z)
• 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)
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler [40.456646238780195]
  Two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. We present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. We experimentally demonstrate CZ and $ZZ$-free iSWAP gates with two-qubit interaction fidelities of $99.76 pm 0.07$% and $99.87 pm 0.23$%, respectively.
  arXiv  Detail & Related papers  (2020-11-02T19:09:43Z)
• Universal non-adiabatic control of small-gap superconducting qubits [47.187609203210705]
  We introduce a superconducting composite qubit formed from two capacitively coupled transmon qubits. We control this low-frequency CQB using solely baseband pulses, non-adiabatic transitions, and coherent Landau-Zener interference. This work demonstrates that universal non-adiabatic control of low-frequency qubits is feasible using solely baseband pulses.
  arXiv  Detail & Related papers  (2020-03-29T22:48:34Z)

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.