Two-qubit logic with anisotropic exchange in a fin field-effect transistor

• URL: http://arxiv.org/abs/2212.02308v1
• Date: Mon, 5 Dec 2022 14:36:25 GMT
• Title: Two-qubit logic with anisotropic exchange in a fin field-effect transistor
• Authors: Simon Geyer, Bence Het\'enyi, Stefano Bosco, Leon C. Camenzind, Rafael S. Eggli, Andreas Fuhrer, Daniel Loss, Richard J. Warburton, Dominik M. Zumb\"uhl and Andreas V. Kuhlmann
• Abstract summary: Hole spin qubits benefit from fast all-electrical qubit control and sweet spots to counteract charge and nuclear spin noise. We demonstrate a controlled rotation two-qubit gate on hole spins in an industry-compatible device. Our work brings hole spin qubits in silicon transistors a step closer to the realization of a large-scale quantum computer.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Semiconductor spin qubits offer a unique opportunity for scalable quantum computation by leveraging classical transistor technology. Hole spin qubits benefit from fast all-electrical qubit control and sweet spots to counteract charge and nuclear spin noise. The demonstration of a two-qubit quantum gate in a silicon fin field-effect transistor, that is, the workhorse device of today's semiconductor industry, has remained an open challenge. Here, we demonstrate a controlled rotation two-qubit gate on hole spins in an industry-compatible device. A short gate time of 24 ns is achieved. The quantum logic exploits an exchange interaction that can be tuned from above 500 MHz to close-to-off. Significantly, the exchange is strikingly anisotropic. By developing a general theory, we show that the anisotropy arises as a consequence of a strong spin-orbit interaction. Upon tunnelling from one quantum dot to the other, the spin is rotated by almost 90 degrees. The exchange Hamiltonian no longer has Heisenberg form and is engineered in such a way that there is no trade-off between speed and fidelity of the two-qubit gate. This ideal behaviour applies over a wide range of magnetic field orientations rendering the concept robust with respect to variations from qubit to qubit. Our work brings hole spin qubits in silicon transistors a step closer to the realization of a large-scale quantum computer.

Related papers

• Quantum Sensing from Gravity as Universal Dephasing Channel for Qubits [41.96816488439435]
  WeExploit the generic phenomena of the gravitational redshift and Aharonov-Bohm phase. We show that entangled quantum states dephase with a universal rate. We propose qubit-based platforms as quantum sensors for precision gravitometers and mechanical strain gauges.
  arXiv  Detail & Related papers  (2024-06-05T13:36:06Z)
• 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)
• 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)
• Direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit [2.6810058988728342]
  Superconducting spin qubits provide a promising alternative to semiconductor qubits. We exploit a different qubit subspace using the spin-split doublet ground state of an electrostatically-defined quantum dot Josephson junction. We embed the Andreev spin qubit in a superconducting transmon qubit, demonstrating strong coherent qubit-qubit coupling.
  arXiv  Detail & Related papers  (2022-08-22T07:09:24Z)
• Hole spin qubits in thin curved quantum wells [0.0]
  Hole spin qubits are frontrunner platforms for scalable quantum computers. Fastest spin qubits to date are defined in long quantum dots with confinement directions. In these systems the lifetime of the qubit is strongly limited by charge noise. We propose a different, scalable qubit design, compatible with planar CMOS technology.
  arXiv  Detail & Related papers  (2022-04-18T08:34:38Z)
• Dephasing of Exchange-coupled Spins in Quantum Dots for Quantum Computing [0.0]
  A spin qubit in semiconductor quantum dots holds promise for quantum information processing. We report progress on spin dephasing of two exchange-coupled spins in a double quantum dot.
  arXiv  Detail & Related papers  (2021-09-06T06:38:20Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
  We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings. The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
  arXiv  Detail & Related papers  (2020-10-21T15:37:59Z)
• Spin shuttling in a silicon double quantum dot [0.0]
  We study a minimal version of spin shuttling between two quantum dots. Spin-orbit interaction and the Zeeman effect in an inhomogeneous magnetic field play an important role for spin shuttling. We find that a spin infidelity as low as $1-F_slesssim 0.002$ with a relatively fast level velocity of $alpha = 600, mu$eV/ns is feasible.
  arXiv  Detail & Related papers  (2020-07-07T16:33:06Z)
• Ultrafast Hole Spin Qubit with Gate-Tunable Spin-Orbit Switch [0.0]
  We demonstrate ultrafast and universal quantum control of a hole spin qubit in a germanium/Silicon core/shell nanowire. We show a large degree of electrical control over the Rabi frequency, Zeeman energy, and coherence time. We identify an exceptionally strong but gate-tunable spin-orbit interaction as the underlying mechanism.
  arXiv  Detail & Related papers  (2020-06-19T15:09:00Z)
• 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.