Magnon-mediated quantum gates for superconducting qubits

• URL: http://arxiv.org/abs/2406.14967v2
• Date: Tue, 10 Sep 2024 08:05:12 GMT
• Title: Magnon-mediated quantum gates for superconducting qubits
• Authors: Martijn Dols, Sanchar Sharma, Lenos Bechara, Yaroslav M. Blanter, Marios Kounalakis, Silvia Viola Kusminskiy,
• Abstract summary: We propose a hybrid quantum system consisting of a magnetic particle inductively coupled to two superconducting transmon qubits. We show that the system can be tuned into three different regimes of effective qubit-qubit interactions.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a hybrid quantum system consisting of a magnetic particle inductively coupled to two superconducting transmon qubits, where qubit-qubit interactions are mediated via magnons. We show that the system can be tuned into three different regimes of effective qubit-qubit interactions, namely a transverse ($XX + YY$), a longitudinal ($ZZ$) and a non-trivial $ZX$ interaction. In addition, we show that an enhanced coupling can be achieved by employing an ellipsoidal magnet, carrying anisotropic magnetic fluctuations. We propose a scheme for realizing two-qubit gates, and simulate their performance under realistic experimental conditions. We find that iSWAP and CZ gates can be performed in this setup with an average fidelity $\gtrsim 99 \% $ , while an iCNOT gate can be applied with an average fidelity $\gtrsim 88 \%$. Our proposed hybrid circuit architecture offers an alternative platform for realizing two-qubit gates between superconducting qubits and could be employed for constructing qubit networks using magnons as mediators.

Related papers

• 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)
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits [0.0]
  Superconductors induce long-range interactions between the spin degrees of freedom of quantum dots. We show that this anisotropy is tunable and enables fast and high-fidelity two-qubit gates between singlet-triplet (ST) spin qubits. Our design is immune to leakage of the quantum information into noncomputational states.
  arXiv  Detail & Related papers  (2023-04-11T09:30:38Z)
• Cat-qubit-inspired gate on cos($2\theta$) qubits [77.34726150561087]
  We introduce a single-qubit $Z$ gate inspired by the noise-bias preserving gate of the Kerr-cat qubit. This scheme relies on a $pi$ rotation in phase space via a beamsplitter-like transformation between a qubit and ancilla qubit.
  arXiv  Detail & Related papers  (2023-04-04T23:06:22Z)
• Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields [62.997667081978825]
  We show that qubit coherence can be improved by tuning defects away from the qubit resonance using an applied DC-electric field. We also discuss how local gate electrodes can be implemented in superconducting quantum processors to enable simultaneous in-situ coherence optimization of individual qubits.
  arXiv  Detail & Related papers  (2022-08-02T16:18:30Z)
• Demonstration of the Two-Fluxonium Cross-Resonance Gate [1.8568045743509223]
  Current implementations of two-qubit gates compromise fluxonium's coherence properties. We realize a fast all-microwave cross-resonance gate between two capacitively-coupled fluxoniums. Our results project a possible pathway towards reducing the two-qubit error rate below $10-4$ with present-day technologies.
  arXiv  Detail & Related papers  (2022-04-25T17:59:17Z)
• 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)
• Hardware-Efficient Microwave-Activated Tunable Coupling Between Superconducting Qubits [0.0]
  We realize a tunable $ZZ$ interaction between two transmon qubits with fixed frequencies and fixed coupling. Because both transmons are driven, it is resilient to microwave crosstalk. We apply this interaction to implement a controlled phase (CZ) gate with a gate fidelity of $99.43(1)%$ as measured by cycle benchmarking.
  arXiv  Detail & Related papers  (2021-05-12T01:06:08Z)
• Coupling two charge qubits via a superconducting resonator operating in the resonant and dispersive regimes [5.526775342940154]
  We describe a new type of charge qubit formed by an electron confined in a triple-quantum-dot system. We present the form for the long-range dipolar coupling between the charge qubit and a superconducting resonator. We find that the fidelity for the iSWAP gate can reach fidelity higher than 99% for the noise level typical in experiments.
  arXiv  Detail & Related papers  (2020-12-28T07:49:41Z)
• 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)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)
• Optimal coupling of HoW$_{10}$ molecular magnets to superconducting circuits near spin clock transitions [85.83811987257297]
  We study the coupling of pure and magnetically diluted crystals of HoW$_10$ magnetic clusters to microwave superconducting coplanar waveguides. Results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizeable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.
  arXiv  Detail & Related papers  (2019-11-18T11:03:06Z)

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.