Superconducting antiqubits achieve optimal phase estimation via unitary inversion

• URL: http://arxiv.org/abs/2506.04315v1
• Date: Wed, 04 Jun 2025 18:00:01 GMT
• Title: Superconducting antiqubits achieve optimal phase estimation via unitary inversion
• Authors: Xingrui Song, Surihan Sean Borjigin, Flavio Salvati, Yu-Xin Wang, Nicole Yunger Halpern, David R. M. Arvidsson-Shukur, Kater Murch,
• Abstract summary: A positron is equivalent to an electron traveling backward through time.<n>We simulate a positron with a transmon subject to particular resonant and off-resonant drives.<n>An antiqubit's effective gyromagnetic ratio equals the negative of a qubit's.
• Score: 15.902631337426316
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A positron is equivalent to an electron traveling backward through time. Casting transmon superconducting qubits as akin to electrons, we simulate a positron with a transmon subject to particular resonant and off-resonant drives. We call positron-like transmons "antiqubits." An antiqubit's effective gyromagnetic ratio equals the negative of a qubit's. This fact enables us to time-invert a unitary implemented on a transmon by its environment. We apply this platform-specific unitary inversion, with qubit--antiqubit entanglement, to achieve a quantum advantage in phase estimation: consider measuring the strength of a field that points in an unknown direction. An entangled qubit--antiqubit sensor offers the greatest possible sensitivity (amount of Fisher information), per qubit, per application of the field. We prove this result theoretically and observe it experimentally. This work shows how antimatter, whether real or simulated, can enable platform-specific unitary inversion and benefit quantum information processing.

Related papers

• Impact of Josephson junction array modes on fluxonium readout [0.0]
  We theoretically analyze measurement-induced state transitions (MIST) during the dispersive readout of a fluxonium qubit.<n>We show that these new kinds of MIST processes can be relevant when using realistic circuit parameters and relatively low readout drive powers.
  arXiv  Detail & Related papers  (2024-12-19T12:28:46Z)
• Field-Based Formalism for Calculating Multi-Qubit Exchange Coupling Rates for Transmon Qubits [0.0]
  Superconducting qubits are one of the most mature platforms for quantum computing. Existing analysis approaches using eigenmode solvers are cumbersome, not robust, and computationally prohibitive if devices with more than a few qubits are to be analyzed. This work begins the development of an alternative framework that we illustrate in the context of evaluating the qubit-qubit exchange coupling rate between transmon qubits.
  arXiv  Detail & Related papers  (2024-06-08T13:31:18Z)
• Measurement-Induced Transmon Ionization [69.65384453064829]
  We develop a comprehensive framework which provides a physical picture of the origin of transmon ionization. This framework identifies the multiphoton resonances responsible for transmon ionization. It also allows one to efficiently compute numerical estimates of the photon number threshold for ionization.
  arXiv  Detail & Related papers  (2024-02-09T18:46:50Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Measurement-Induced State Transitions in a Superconducting Qubit: Within the Rotating Wave Approximation [33.65845920594661]
  We study resonant transitions between levels in the coupled qubit-resonator system that exhibit noisy behavior when measured repeatedly in time. Our results suggest the transmon is excited to levels near the top of its cosine potential following a state transition.
  arXiv  Detail & Related papers  (2022-12-09T19:48:55Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• Spectral kissing and its dynamical consequences in the squeeze-driven Kerr oscillator [0.0]
  Transmon qubits are the predominant element in circuit-based quantum information processing. We show that the spectral kissing (coalescence of pairs of energy levels) experimentally observed in the effective Hamiltonian of a driven SNAIL-transmon is an ESQPT precursor.
  arXiv  Detail & Related papers  (2022-10-13T18:00:03Z)
• Observation of entanglement negativity transition of pseudo-random mixed states [23.43987389179338]
  Multipartite entanglement is a key resource for quantum computation. Here, we report the observation of entanglement transition quantified by negativity using a fully connected 20-qubit superconducting processor. Our simulator provides a powerful tool to generate random states and understand the entanglement structure for multipartite quantum systems.
  arXiv  Detail & Related papers  (2022-08-29T02:56:05Z)
• Reminiscence of classical chaos in driven transmons [117.851325578242]
  We show that even off-resonant drives can cause strong modifications to the structure of the transmon spectrum rendering a large part of it chaotic. Results lead to a photon number threshold characterizing the appearance of chaos-induced quantum demolition effects.
  arXiv  Detail & Related papers  (2022-07-19T16:04:46Z)
• First design of a superconducting qubit for the QUB-IT experiment [50.591267188664666]
  The goal of the QUB-IT project is to realize an itinerant single-photon counter exploiting Quantum Non Demolition (QND) measurements and entangled qubits. We present the design and simulation of the first superconducting device consisting of a transmon qubit coupled to a resonator using Qiskit-Metal.
  arXiv  Detail & Related papers  (2022-07-18T07:05:10Z)
• Single-qubit remote manipulation by magnetic solitons [62.997667081978825]
  Magnetic solitons can constitute a means for manipulating qubits from a distance. When a suitable soliton passes by, the coupled qubit undergoes nontrivial operations.
  arXiv  Detail & Related papers  (2021-04-07T08:28:49Z)
• Observation of Bloch Oscillations and Wannier-Stark Localization on a Superconducting Processor [14.413924121049094]
  Bloch oscillation (BO) and Wannier-Stark localization (WSL) are fundamental concepts about metal-insulator transitions in condensed matter physics. We report experimental investigation of BOs and WSL simulated with a 5-qubit programmable superconducting processor.
  arXiv  Detail & Related papers  (2020-07-17T09:29:37Z)
• Information transfer by quantum matterwave modulation [68.8204255655161]
  We show that matterwaves can be applied for information transfer and that their quantum nature provides a high level of security. Our technique allows transmitting a message by a non-trivial modulation of an electron matterwave in a biprism interferometer. We also present a key distribution protocol based on the quantum nature of the matterwaves that can reveal active eavesdropping.
  arXiv  Detail & Related papers  (2020-03-19T03:37:01Z)

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.