Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session PP06: V: Focus Session: Error Mitigation and Noise ReductionFocus
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Sponsoring Units: DQI Chair: Mengren Wu, University of Illinois at Chicago Room: Virtual Room 6 |
Tuesday, March 21, 2023 9:00AM - 9:36AM |
PP06.00001: Error mitigation for fermionic simulation Invited Speaker: Stasja Stanisic Simulation of fermionic systems is a promising application of noisy intermediate-scale quantum (NISQ) computers, with hopes of genuinely exciting problems being tackled on as few as 50 qubits. While the number of qubits in NISQ devices is already within the regime where we can execute classically challenging and theoretically interesting experiments, the noise present on these devices can be prohibitive. To solve this problem, over the last few years various error mitigation techniques have been developed, attempting to limit and reduce errors, with variable levels of practical success. Here I will present our work on an error mitigation strategy practically useful for fermionic systems. It relies on fermionic linear optical (FLO) circuits which are efficiently classically simulable, allowing us to find exact outcomes of these circuits using classical computers, and then inferring the relationship between exact and noisy outcomes from the NISQ device. This relationship can then be used to invert the noise on other circuits which are not classically simulable. First, we will see how the algorithm works and the promise it holds in simulation. We will look at its powerful error mitigation on two NISQ devices, the Rigetti Aspen chip and Google Quantum AI Sycamore chip, when applied to a Hamiltonian Variational ansatz solving for the ground state of the Fermi-Hubbard model. Finally, we will briefly look at other error mitigation strategies that made a real-world difference in our Fermi-Hubbard simulation. |
Tuesday, March 21, 2023 9:36AM - 9:48AM |
PP06.00002: Extracting Coherent and Decoherent Qubit Errors Using Folded Cycles and K-body Noise Reconstruction Patrick Dreher, Arnaud Carignan-Dugas, Shashank K Ranu The accuracy of quantum computational results from today's Noisy Intermediate Scale Quantum (NISQ) hardware platforms is limited by a combination of errors arising entirely within the evolution of the quantum system coherent errors (rcoh ) and those associated with the evolution of the quantum system and its environment decoherent errors (rdecoh ). In this paper we rigorously develop a new efficient and scalable protocol that can separately compute both the coherent and decoherent contributions to the total infidelity of any Clifford operation of interest. Using the Lindblad equation, we derive a power law relationship for the propagation of coherent errors versus circuit depth. We test this derived analytical power law relationship using a two qubit CNOT and a single qubit combination to measure a complete set of error contributions in X, Y and Z using the K-Body Noise Reconstruction (KNR). With this information a curve fitting procedure was implemented to calculate the magnitude of the coherent error in this circuit. This protocol was tested and verified on several IBM gate-based superconducting hardware platforms. This new scalable protocol for independently measuring the contributions from the coherent and decoherent errors can be applied to both improve calibration routines for today's hardware platforms and provide helpful insights for enhancing the design of existing and future quantum architectures. |
Tuesday, March 21, 2023 9:48AM - 10:00AM |
PP06.00003: Applying NOX Error Mitigation Protocols to Calculate Real-time Quantum Field Theory Scattering Phase Shifts Zachary Parks, Arnaud Carignan-Dugas, Erik Gustafson, Yannick L Meurice, Patrick Dreher Real-time scattering calculations on a NISQ quantum computer will have both unitary and stochastic errors. Randomized compilation can transform these unitary errors into stochastic ones. This letter reports on a method that estimates the stochastic errors and then uses this information to implement a new scalable Noiseless Output Extrapolation (NOX) error mitigation strategy that will permit the calculation of a phase shift from a scattering event in the Transverse Ising model with calculable error bars. |
Tuesday, March 21, 2023 10:00AM - 10:12AM |
PP06.00004: Control and mitigation of coherent errors with superconducting qubits Ruixia Wang Improving gate performance is vital for scalable quantum computing. The universal quantum computing also requires the gate fidelity to reach a high level. For superconducting quantum processor, which operates in the microwave band, the single-qubit gates are usually realized with microwave driving. Coherent errors always happen during the one- and two-qubit operations. In this talk, we would like to analyze the coherent error effects to the single-qubit gate and propose an error mitigation scheme. There are three steps in our error mitigation method. First is the controlling of the detuning between qubits. Second, by applying the general decomposition procedure, arbitrary single-qubit gate can be decomposed as a sequence of X and virtual Z gates. Finally, by optimizing the parameters in virtual Z gates, the error constrained in the computational space can be corrected. Using our method, no additional compensation signals are needed, arbitrary single-qubit gate time will not be prolonged, and the circuit depth containing simultaneous single-qubit gates will also not increase. |
Tuesday, March 21, 2023 10:12AM - 10:24AM |
PP06.00005: Noise Spectroscopy Without Dynamical Decoupling Pulses Nanako Shitara, Arian Vezvaee, Andrés Montoya-Castillo, Shuo Sun Spectral characterization of noise environments that lead to the decoherence of qubits is critical to developing robust quantum technologies. While dynamical decoupling offers one of the most successful approaches to characterize noise spectra, it necessitates applying large sequences of π pulses that increase the complexity and cost of the method. In this talk, I will introduce a noise spectroscopy method that utilizes only the Fourier transform of free induction decay measurements, thus removing the need for the application any π pulses. This method faithfully recovers the correct noise spectra and outperforms previous dynamical decoupling schemes while significantly reducing its experimental overhead. I will also discuss the experimental feasibility of our proposal and demonstrate its robustness in the presence of statistical measurement noise. Our method is applicable to a wide range of quantum platforms and provides a simpler path toward a more accurate spectral characterization of quantum devices, thus offering possibilities for tailored decoherence mitigation. |
Tuesday, March 21, 2023 10:24AM - 10:36AM |
PP06.00006: Scalable method for eliminating residual $ZZ$ interaction between superconducting qubits Zhongchu Ni, Sai Li, Libo Zhang, Ji Chu, Jingjing Niu, Tongxing Yan, Xiuhao Deng, Ling Hu, Jian Li, Youpeng Zhong, Song Liu, Fei Yan, Yuan Xu, Dapeng Yu Unwanted $ZZ$ interaction is a quantum-mechanical crosstalk phenomenon which correlates qubit dynamics and is ubiquitous in superconducting qubit system. It adversely affects the quality of quantum operations and can be detrimental in scalable quantum information processing. Here we propose and experimentally demonstrate a practically extensible approach for complete cancellation of residual $ZZ$ interaction between fixed-frequency transmon qubits, which are known for long coherence and simple control. We apply to the intermediate coupler that connects the qubits a weak microwave drive at a properly chosen frequency in order to noninvasively induce ac Stark shift for $ZZ$ cancellation. We verify the cancellation performance by measuring vanishing two-qubit entangling phases and $ZZ$ correlations. In addition, we implement randomized benchmarking experiment to extract the idling gate fidelity which shows good agreement with the coherence limit, demonstrating the effectiveness of $ZZ$ cancellation. Our method allows independent addressability of each qubit-qubit connection, and is applicable to both non-tunable and tunable coupler, promising better compatibility with future large-scale quantum processors. |
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