This article is about, quantum noise mitigation methods, covering two methods.
1. QuantumNAS - quantum adaptive noise search from MIT :
:Researchers have developed a technique for making quantum computing more resilient to noise, which boosts performance.
Image credit: Christine Daniloff, MIT
see the original article from MIT website here
Currently, quantum computers are in the NISQ (noisy intermediate-scale quantum). A noise mitigation technology is needed to propel NISQ to Quantum Advantage and beyond the quantum supremacy era. I read this article on the MIT website. I made the content a bit shorter and included the original, more extended version.
Interference from the environment, imperfect control systems (lasers and microwave, other measurement methods), and unwanted interactions between qubits can cause "noise," leading to errors in computation. For a quantum computation and read-out, a "quantum circuit," a series of operations called quantum gates, is needed to do quantum computation.
In a typical "run and execute" cycle, these quantum gates (mapped to the individual qubits) change the quantum states of specific qubits, which then perform the calculations to solve a problem. Still, quantum gate operations can introduce "noise," hampering a quantum machine's performance.
In a typical "run and execute" cycle, these quantum gates (mapped to the individual qubits) change the quantum states of specific qubits, which then perform the calculations to solve a problem. Still, quantum gate operations can introduce "noise," hampering a quantum machine's performance.
The team created a framework that can identify the most robust quantum circuit for a particular computing task and generate a mapping pattern that is tailored to the qubits of a targeted quantum device.
The new method is called "QuantumNAS," which means adaptive noise search. The framework in which the computation is performed is computationally less intensive, improving quantum circuit accuracy in quantum chemistry and machine learning. Although there are other methods, Quantum NAS outperforms the rest.
That is an exciting news. I wonder if it can improve the new ionq's quantum computer error rate.
2. "Efficient noise mitigation methods"
"Quantum computers have enabled solving problems beyond the current computers' capabilities. However, this requires handling noise arising from unwanted interactions in these systems. Several protocols have been proposed to address efficient and accurate quantum noise profiling and mitigation. In this work, we propose a novel protocol that efficiently estimates the average output of a noisy quantum device to be used for quantum noise mitigation. The multi-qubit system average behavior is approximated as a special form of a Pauli Channel where Clifford gates are used to estimate the average output for circuits of different depths. The characterized Pauli channel error rates, and state preparation and measurement errors are then used to construct the outputs for different depths thereby eliminating the need for large simulations and enabling efficient mitigation. We demonstrate the efficiency of the proposed protocol on four IBM Q 5-qubit quantum devices. Our method demonstrates improved accuracy with efficient noise characterization. We report up to 88\% and 69\% improvement for the proposed approach compared to the unmitigated, and pure measurement error mitigation approaches, respectively."
Here is the discussion section:
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