India’s Qubit Defect Mitigation: Taming Two-Level System Noise

The problems being solved

Superconducting qubits, the building blocks of many quantum processors, are plagued by microscopic defects that behave as two-level systems (TLS). These TLS interact with qubits, stealing energy and destroying the fragile quantum states needed for computation. The result is decoherence—a rapid loss of information that limits coherence times and introduces errors.

Indian patent activity highlights a particular concern around strongly coupled TLS, where the interaction is so intense that error rates spike dramatically. This is not a minor nuisance; it is a fundamental roadblock to scaling quantum computers beyond a handful of qubits. Without effective mitigation, the promise of fault-tolerant quantum computing remains out of reach.

How the field is solving it

Rather than trying to eliminate defects at the fabrication level—a nearly impossible task with current materials—Indian inventors are turning to active mitigation. The core idea is to use light pulses to scramble the TLS, effectively randomizing their state so they no longer coherently sap energy from the qubit.

One approach, detailed in Indian patent filings, involves iteratively applying optical scrambling pulses guided by real-time measurements of qubit relaxation times. When a qubit’s relaxation time dips, a targeted light pulse is fired to reshuffle the offending TLS. A related technique focuses on selective optical scrambling, zeroing in on the most strongly coupled defects that cause the worst decoherence. Both methods share a common thread: they treat defect mitigation as a dynamic, feedback-driven process rather than a one-time fix.

• Iterative light pulse scrambling based on measured qubit relaxation times
• Selective optical scrambling targeting strongly coupled two-level systems
• Relaxation time measurement as a guide for applying corrective pulses

Where the market is heading

The global market for quantum error correction materials, which includes defect mitigation solutions, is valued in the low hundreds of millions of dollars and growing at a double-digit annual rate, according to Global Market Insights. The broader quantum computing market, pegged at roughly USD 3–4 billion by MarketsandMarkets, is expanding at over 40% annually. This momentum is fueled by an urgent demand for fault-tolerant machines that can tackle real-world problems.

Material engineering breakthroughs—ultra-pure silicon, diamond colour centres—are complementing software and optical mitigation strategies. Meanwhile, as quantum chips scale, hardware defects become inevitable, spurring development of routing-based and position-resolving techniques. India’s deep tech policy push is creating a supportive backdrop, even if dedicated qubit defect mitigation programs are still emerging. The alignment of global market pull and local innovation capacity signals a fertile ground for Indian contributions.

The white space

Current optical scrambling methods focus squarely on TLS, but qubits also suffer from other noise sources—charge noise, flux noise, and non-TLS defects—that are largely unaddressed. Extending mitigation to these domains represents a significant opportunity for Indian researchers to broaden the impact of their work.

Scalability is another open frontier. Demonstrating that light-pulse scrambling works on a single qubit is a start; making it practical across a large quantum processor with hundreds or thousands of qubits, without introducing new errors or latency, is the next leap. Innovators who solve this will help move quantum computing from laboratory curiosity to industrial tool.

• Mitigation of non-TLS defects such as charge and flux noise
• Scalable optical scrambling for large qubit arrays
• Integration with error correction codes for holistic fault tolerance

Explore the innovators

The specific inventors, patents, and companies working on qubit defect mitigation in India can be explored on Deeptech Navigator. From optical scrambling protocols to relaxation-time-guided feedback loops, the landscape reveals a community quietly building the foundations for more resilient quantum hardware.

In our data

Sources

• Routing-based technique for defect mitigation in quantum error correction ↗
• Resolving the positions of defects in superconducting quantum bits - PMC ↗
• Material Defects in Superconducting Quantum Computers | Seminar ... ↗
• The Global Quantum Computing Supply Chain 2026–2036 ↗
• The Quantum Supply Chain: Market Map & Key Players for 2026 ↗
• The Supply Chain Chokepoints in Quantum ↗
• Quantum Computing Market Size, Share & Trends ↗
• Quantum Error Correction Materials Market Size ↗