Radio-frequency cascade readout and coherent exchange control of spin qubits fabricated using a 300 mm wafer process

• URL: http://arxiv.org/abs/2408.01241v3
• Date: Wed, 19 Mar 2025 17:50:18 GMT
• Title: Radio-frequency cascade readout and coherent exchange control of spin qubits fabricated using a 300 mm wafer process
• Authors: Jacob F. Chittock-Wood, Ross C. C. Leon, Michael A. Fogarty, Tara Murphy, Sofia M. Patomäki, Giovanni A. Oakes, James Williams, Felix-Ekkehard von Horstig, Nathan Johnson, Julien Jussot, Stefan Kubicek, Bogdan Govoreanu, David F. Wise, M. Fernando Gonzalez-Zalba, John J. L. Morton,
• Abstract summary: We show coherent control of two electron spins using the spin-spin exchange interaction, which forms the basis for entangling gates such as $sqrttextSWAP$.<n>For readout, we introduce a novel dispersive readout technique, the radio-frequency electron cascade, that simplifies the qubits unit cell while providing high gain.<n>The combination of sensitive dispersive readout with industrial-grade manufacturing marks a crucial step towards the large-scale integration of silicon quantum processors.
• Score: 0.609562679184219
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Leveraging advanced semiconductor manufacturing promises potential for scaling up silicon-based quantum processors. In this context, control and readout of individual spin qubits have been shown on devices manufactured on 300 mm wafer metal-oxide-semiconductor (MOS) processes, yet quantum processors require two-qubit interactions to operate. Here, we use a 300 mm natural silicon MOS process customized for spin qubits and demonstrate coherent control of two electron spins using the spin-spin exchange interaction, which forms the basis for entangling gates such as $\sqrt{\text{SWAP}}$. We observe gate dephasing times of up to $T_2^{*}\approx500$ ns and a gate quality factor of $10$. For readout, we introduce a novel dispersive readout technique, the radio-frequency electron cascade, that simplifies the qubits unit cell while providing high gain. We achieve a $74\%$ singlet-triplet readout fidelity in $8~\mu$s integration time, the highest-performing dispersive readout demonstration on a planar MOS process. The combination of sensitive dispersive readout with industrial-grade manufacturing marks a crucial step towards the large-scale integration of silicon quantum processors.

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. We present a design for a multi-chip module comprising one carrier chip and four qubit modules. 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. 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)
• A 300 mm foundry silicon spin qubit unit cell exceeding 99% fidelity in all operations [0.2398431050362945]
  Fabrication of quantum processors in advanced 300 mm wafer-scale complementary metal-oxide-semiconductor (CMOS) foundries provides a unique scaling pathway towards commercially viable quantum computing. Here, we show precise qubit operation of a silicon two-qubit device made in a 300 mm semiconductor processing line.
  arXiv  Detail & Related papers  (2024-10-21T02:18:35Z)
• Probing single electrons across 300 mm spin qubit wafers [0.0]
  We present a testing process using a cryogenic 300 mm wafer prober to collect high-volume data on the performance of hundreds of industry-manufactured spin qubit devices at 1.6 K. We analyze the random variation in single-electron operating voltages and find that the optimized fabrication process leads to low levels of disorder at the 300 mm scale.
  arXiv  Detail & Related papers  (2023-07-10T18:02:55Z)
• An integrated microwave-to-optics interface for scalable quantum computing [47.187609203210705]
  We present a new design for an integrated transducer based on a superconducting resonator coupled to a silicon photonic cavity. We experimentally demonstrate its unique performance and potential for simultaneously realizing all of the above conditions. Our device couples directly to a 50-Ohm transmission line and can easily be scaled to a large number of transducers on a single chip.
  arXiv  Detail & Related papers  (2022-10-27T18:05:01Z)
• Modelling semiconductor spin qubits and their charge noise environment for quantum gate fidelity estimation [0.9406493726662083]
  The spin of an electron confined in semiconductor quantum dots is a promising candidate for quantum bit (qubit) implementations. We present here a co-modelling framework for double quantum dot (DQD) devices and their charge noise environment. We find an inverse correlation between quantum gate errors and quantum dot confinement.
  arXiv  Detail & Related papers  (2022-10-10T10:12:54Z)
• Tunable photon-mediated interactions between spin-1 systems [68.8204255655161]
  We show how to harness multi-level emitters with several optical transitions to engineer photon-mediated interactions between effective spin-1 systems. Our results expand the quantum simulation toolbox available in cavity QED and quantum nanophotonic setups.
  arXiv  Detail & Related papers  (2022-06-03T14:52:34Z)
• 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)
• Uniform Spin Qubit Devices in an All-Silicon 300 mm Integrated Process [0.0]
  We demonstrate excellent qubit device uniformity and tunability from 300K down to mK temperatures. This is achieved, for the first time, by integrating an overlapping poly silicon-based gate stack in an 'all-Silicon' and lithographically flexible 300mm flow. These low-disorder, uniform coupling devices and 300mm fab integration pave the way for fast scale-up to large quantum processors.
  arXiv  Detail & Related papers  (2021-08-24T12:07:47Z)
• Precision tomography of a three-qubit donor quantum processor in silicon [38.42250061908039]
  Nuclear spins were among the first physical platforms to be considered for quantum information processing. We demonstrate universal quantum logic operations using a pair of ion-implanted 31P donor nuclei in a silicon nanoelectronic device.
  arXiv  Detail & Related papers  (2021-06-06T10:30:38Z)
• Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register [48.7576911714538]
  Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. We propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register.
  arXiv  Detail & Related papers  (2021-04-26T14:41:01Z)
• Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
  We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor. We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
  arXiv  Detail & Related papers  (2021-01-21T22:18:49Z)
• A Frequency-Multiplexed Coherent Electro-Optic Memory in Rare Earth Doped Nanoparticles [94.37521840642141]
  Quantum memories for light are essential components in quantum technologies like long-distance quantum communication and distributed quantum computing. Recent studies have shown that long optical and spin coherence lifetimes can be observed in rare earth doped nanoparticles. We report on coherent light storage in Eu$3+$:Y$$O$_3$ nanoparticles using the Stark Echo Modulation Memory (SEMM) quantum protocol.
  arXiv  Detail & Related papers  (2020-06-17T13:25:54Z)
• 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)
• Spin readout of a CMOS quantum dot by gate reflectometry and spin-dependent tunnelling [0.0]
  We report the measurement of an electron spin in a singly-occupied gate-defined quantum dot fabricated using CMOS processes at the 300 mm wafer scale. We demonstrate spin readout in two devices using this technique, obtaining valley splittings in the range 0.5-0.7 meV using excited state spectroscopy. These long lifetimes indicate the silicon nanowire geometry and fabrication processes employed here show a great deal of promise for qubit devices.
  arXiv  Detail & Related papers  (2020-05-15T19:52:18Z)
• Near-degenerate quadrature-squeezed vacuum generation on a silicon-nitride chip [54.87128096861778]
  In this Letter, we demonstrate the generation of quadrature-phase squeezed states in the radio-frequency carrier sideband using a small-footprint silicon-nitride microresonator with a dual-pumped four-wave-mixing process. It is critical to account for the nonlinear behavior of the pump fields to properly predict the squeezing that can be generated in this system.
  arXiv  Detail & Related papers  (2020-02-04T01:41:41Z)

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.