Raman Research Institute Scientists Unveil New Technique to Delay Quantum Entanglement Collapse

Scientists at the Quantum Information and Computing (QuIC) laboratory at Raman Research Institute in Bengaluru have demonstrated a novel way to increase the stability of the quantum states that enable computation in a quantum computer that can potentially improve the reliability and integrity of these calculations. Unlike traditional computers that encode electric states into 0s and 1s to store and process information.

The entangled state, for example, disintegrates very quickly on interaction with the external environment, a phenomenon known as decoherence. Sometimes, entanglement vanishes abruptly, too, even before the normal disintegration takes place.

Scientists call this condition “entanglement sudden death.” ExplainedSingle-shot fixRaman Research Institute scientists found that a single, well-timed operation, not repeated fixes, can delay or prevent quantum entanglement from collapsing in this context. Timing itself becomes a new control tool. Offering a simpler way to protect fragile quantum states used in computing, alongside existing error- correction methods.

This weakness creates a problem for quantum computing. The integrity of the calculations becomes doubtful. Scientists have tried to deal with this challenge But these repetitive interventions have their own side-effects.

They are costly, and can introduce errors of their own. This is where the research team of Urbasi Sinha, group leader of the lab at RRI, has achieved a breakthrough.

Instead of repetitive operations, her team has developed a new technique that deals with decoherence in this context through a “single-shot operation.” Depending on the instant when the operation is carried out, this operation can delay decoherence and entirely avoid sudden death. Applied at some other instant, this operation can even hasten decoherence, though it is not an outcome that is scientifically desirable.

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This operation, therefore, gives scientists greater control over the different possibilities. “To me, the heart of the result is that that the timing of the operation is not just an experimental detail, it can be a control resource,” said Sinha, a senior professor at RRI. She said her experiments presented a proof of concept.

Something that has relevance to the problem of decoherence, rather than a complete solution. It would need to be tested out The results of experiments “We are not claiming to have solved decoherence or replaced quantum error correction, rather the work identifies timing itself as another control parameter that future quantum processors could exploit alongside better materials, better gates, and error-correction protocols,” she said.

“Our experiment shows that one does not always have to fight decoherence with long sequences of corrective operations. The timing of a single local gate can redirect the entanglement trajectory and extend the regime over which the state remains useful,” she said.

Scientists Quantum Information Computing Quic

Scientists at the Quantum Information and Computing (QuIC) laboratory at Raman Research Institute in Bengaluru have demonstrated a novel way to increase the stability of the quantum states that enable computation in a quantum computer that can potentially improve the reliability and integrity of these calculations. Unlike traditional computers that encode electric states into 0s and 1s to store and process information.

The entangled state, for example, disintegrates very quickly on interaction with the external environment, a phenomenon known as decoherence. Sometimes, entanglement vanishes abruptly, too, even before the normal disintegration takes place.

Scientists call this condition “entanglement sudden death.” ExplainedSingle-shot fixRaman Research Institute scientists found that a single, well-timed operation, not repeated fixes, can delay or prevent quantum entanglement from collapsing in this context. Timing itself becomes a new control tool. Offering a simpler way to protect fragile quantum states used in computing, alongside existing error- correction methods.

This weakness creates a problem for quantum computing. The integrity of the calculations becomes doubtful. Scientists have tried to deal with this challenge But these repetitive interventions have their own side-effects.

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They are costly, and can introduce errors of their own. This is where the research team of Urbasi Sinha, group leader of the lab at RRI, has achieved a breakthrough.

Instead of repetitive operations, her team has developed a new technique that deals with decoherence in this context through a “single-shot operation.” Depending on the instant when the operation is carried out, this operation can delay decoherence and entirely avoid sudden death. Applied at some other instant, this operation can even hasten decoherence, though it is not an outcome that is scientifically desirable.

This operation, therefore, gives scientists greater control over the different possibilities. “To me, the heart of the result is that that the timing of the operation is not just an experimental detail, it can be a control resource,” said Sinha, a senior professor at RRI. She said her experiments presented a proof of concept.

Something that has relevance to the problem of decoherence, rather than a complete solution. It would need to be tested out The results of experiments “We are not claiming to have solved decoherence or replaced quantum error correction, rather the work identifies timing itself as another control parameter that future quantum processors could exploit alongside better materials, better gates, and error-correction protocols,” she said.

“Our experiment shows that one does not always have to fight decoherence with long sequences of corrective operations. The timing of a single local gate can redirect the entanglement trajectory and extend the regime over which the state remains useful,” she said.