Related papers: Spontaneous Raman scattering from metastable states of Ba$^+$

Spontaneous Raman scattering from metastable states of Ba$^+$

URL: http://arxiv.org/abs/2505.22466v1
Date: Wed, 28 May 2025 15:19:21 GMT
Title: Spontaneous Raman scattering from metastable states of Ba$^+$
Authors: Timothy J. Burke, Xiaoyang Shi, Jasmine Sinanan-Singh, Isaac L. Chuang, John Chiaverini,
Abstract summary: Quantum logic gates performed via two-photon stimulated-Raman transitions in ions and atoms are fundamentally limited by spontaneous scattering errors.<n>Recent theoretical treatment of these scattering processes has predicted no lower bound on the error rate of such gates when implemented with far-detuned lasers.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Quantum logic gates performed via two-photon stimulated-Raman transitions in ions and atoms are fundamentally limited by spontaneous scattering errors. Recent theoretical treatment of these scattering processes has predicted no lower bound on the error rate of such gates when implemented with far-detuned lasers, while also providing an extension to metastable qubits. To validate this theoretical model, we provide experimental measurements of Raman scattering rates due to near-, and far-detuned lasers for initial states in the metastable D$_{5/2}$ level of $^{137}$Ba$^+$. The measured spontaneous Raman scattering rate is consistent with the theoretical prediction and suggests that metastable-level two-qubit gates with an error rate $\approx10^{-4}$ are possible with laser excitation detuned by tens of terahertz or more.

Related papers

Spontaneous Raman scattering out of a metastable atomic qubit [0.0]
We measure spontaneous Raman scattering rates out of a metastable $D_5/2$ qubit manifold of a single trapped $40$Ca$+$ ion illuminated by 976 nm light.<n>This supports the calculation of error rates from both types of scattering during one- and two-qubit gates.
arXiv Detail & Related papers (2025-05-07T23:32:33Z)
In-situ-tunable spin-spin interactions in a Penning trap with in-bore optomechanics [41.94295877935867]
We present an optomechanical system for in-situ tuning of the coherent spin-motion and spin-spin interaction strength. We characterize the system using measurements of the induced mean-field spin precession. These experiments show approximately a $times2$ variation in the ratio of the coherent to incoherent interaction strength.
arXiv Detail & Related papers (2024-01-31T11:00:39Z)
Finite Pulse-Time Effects in Long-Baseline Quantum Clock Interferometry [45.73541813564926]
We study the interplay of the quantum center-of-mass $-$ that can become delocalized $-$ together with the internal clock transitions. We show at the example of a Gaussian laser beam that the proposed quantum-clock interferometers are stable against perturbations from varying optical fields.
arXiv Detail & Related papers (2023-09-25T18:00:03Z)
Second-Order Coherence Across the Brillouin Lasing Threshold [0.0]
Brillouin-Mandelstam scattering is a three-wave mixing process between two optical fields and one acoustic field. We employ quantum optical techniques to characterize the second-order coherence of Stokes scattering across the Brillouin lasing threshold. Results demonstrate that applying second-order-coherence and photon-counting measurements to Brillouin scattering provides new methods to advance our understanding of Brillouin scattering.
arXiv Detail & Related papers (2023-07-21T10:48:06Z)
A high-flux source system for matter-wave interferometry exploiting tunable interactions [33.92525320044496]
Atom interferometers allow determining inertial effects to high accuracy. Here we report on a high-flux source of ultra-cold atoms with free expansion rates near the Heisenberg limit directly upon release from the trap.
arXiv Detail & Related papers (2023-07-13T14:10:53Z)
Errors in stimulated-Raman-induced logic gates in $^{133}$Ba$^+$ [0.0]
133mathrmBa+$ is illuminated by a laser that is far-detuned from optical transitions, and the resulting spontaneous Raman scattering rate is measured. The observed scattering rate is lower than previous theoretical estimates.
arXiv Detail & Related papers (2022-12-05T21:44:30Z)
Photon scattering errors during stimulated Raman transitions in trapped-ion qubits [0.0]
We study photon scattering errors in stimulated Raman driven quantum logic gates. Previous models significantly overestimate the gate error rate due to photon scattering. gate errors below $10-4$ are achievable for all commonly-used trapped ions.
arXiv Detail & Related papers (2022-11-01T20:56:22Z)
Phase Randomness in a Semiconductor Laser: the Issue of Quantum Random Number Generation [83.48996461770017]
This paper describes theoretical and experimental methods for estimating the degree of phase randomization in a gain-switched laser. We show that the interference signal remains quantum in nature even in the presence of classical phase drift in the interferometer.
arXiv Detail & Related papers (2022-09-20T14:07:39Z)
Quantum density matrix theory for a laser without adiabatic elimination of the population inversion: transition to lasing in the class-B limit [62.997667081978825]
No class-B quantum density-matrix model is available to date, capable of accurately describing coherence and photon correlations within a unified theory. Here we carry out a density-matrix theoretical approach for generic class-B lasers, and provide closed equations for the photonic and atomic reduced density matrix in the Fock basis of photons. This model enables the study of few-photon bifurcations and non-classical photon correlations in class-B laser devices, also leveraging quantum descriptions of coherently coupled nanolaser arrays.
arXiv Detail & Related papers (2022-05-26T16:33:51Z)
Perturbation approach in Heisenberg equations for lasers [77.34726150561087]
It is found that fluctuations of population significantly affect spontaneous and stimulated emissions into the lasing mode. The method can be applied to various resonant systems in quantum optics.
arXiv Detail & Related papers (2022-01-08T18:24:37Z)
Quantum correlations, entanglement spectrum and coherence of two-particle reduced density matrix in the Extended Hubbard Model [62.997667081978825]
We study the ground state properties of the one-dimensional extended Hubbard model at half-filling. In particular, in the superconducting region, we obtain that the entanglement spectrum signals a transition between a dominant singlet (SS) to triplet (TS) pairing ordering in the system.
arXiv Detail & Related papers (2021-10-29T21:02:24Z)
Quantum parity conservation in planar quantum electrodynamics [0.0]
Quantum parity conservation is verified at all orders in perturbation theory for a massless parity-even $U(1)times U(1)$ planar quantum electrodynamics (QED$_3$) model. The presence of two massless fermions requires the Lowenstein-Zimmermann (LZ) subtraction scheme, in the framework of the Bogoliubov-Parasiuk-Hepp-Zimmermann-Lowenstein (BPHZL) renormalization method.
arXiv Detail & Related papers (2020-10-07T02:49:16Z)

This list is automatically generated from the titles and abstracts of the papers in this site.