"RRI Scientists Demonstrate Timing-Based Control Over Quantum Entanglement Decoherence"
Qubit
quantum bit that can exist in superposition — both 0 and 1 simultaneously — unlike a classical bit.
Superposition
the ability of a quantum particle to exist in multiple states at the same time until measured.
Quantum computing is a fundamentally different model of computation. Classical computers process information as binary bits, each bit is either 0 or 1. A qubit (quantum bit) can exist in both states simultaneously, a property called superposition. This allows quantum computers to explore many computational paths at once, making them potentially far more powerful than classical machines for specific problems such as cryptography, drug discovery, and materials simulation.
Entanglement is a second core quantum property. When two particles are entangled, the state of one is instantly correlated with the state of the other, regardless of the distance between them. Quantum computers use entanglement to coordinate information across qubits, enabling computations that no classical system can replicate efficiently. Without sustained entanglement, a quantum computer loses its advantage. Hardware-level approaches to preserving entanglement have attracted significant global attention. Microsoft's Majorana 1 chip, for instance, uses topological qubits, a physical architecture designed to make qubits inherently more resistant to environmental disturbance. The RRI team's work takes a different, complementary route: rather than redesigning the hardware, it identifies timing itself as a control resource at the protocol level.
India's institutional response to quantum technology is the National Quantum Mission (NQM), approved with an outlay of ₹6,003 crore over eight years under the Department of Science and Technology (DST). The NQM targets quantum computers with 50–1,000 physical qubits and envisages four Thematic Hubs (T-Hubs) anchored in academic and national R&D institutions. The Raman Research Institute (RRI), an autonomous institution under DST based in Bengaluru, is one of the key nodes in this ecosystem.
The central challenge in quantum computing is decoherence. Quantum systems lose their quantum properties when they interact with the surrounding environment. Even small disturbances, called noise, cause the entanglement between two qubits to weaken and eventually vanish. In some cases, entanglement does not decay gradually. It disappears abruptly at a finite point in time. Scientists call this entanglement sudden death (ESD). ESD is particularly damaging because it ends a computation before it can be completed, with no warning.
The standard response to decoherence has been quantum error correction (QEC), sequences of repeated corrective operations that monitor and restore quantum states. QEC is resource-intensive. It requires many additional physical qubits to protect each logical qubit, and the corrective operations themselves can introduce new errors. …
Which of the following statements with regard to the National Quantum Mission (NQM) is/are correct?
1.It aims at developing intermediate-scale quantum computers with 50-1000 physical qubits.
2.Its implementation includes setting up of four Thematic Hubs (T-Hubs) in academic and national R&D institutes across India.
Select the answer using the code given below:
Consider the following statements:
I.It is expected that Majorana 1 chip will enable quantum computing.
II.Majorana 1 chip has been introduced by Amazon Web Services (AWS).
III.Deep learning is a subset of machine learning.
Which of the statements given above are correct?
Which one of the following is the context in which the term "qubit" is mentioned?
Consider the following statements regarding the National Quantum Mission (NQM) of India:
1.It is implemented by the Department of Science and Technology.
2.It targets quantum computers with 50–1,000 physical qubits.
3.It envisages four Thematic Hubs (T-Hubs) in academic and national R&D institutions.
4.The Raman Research Institute (RRI) is an autonomous body under the Ministry of Electronics and Information Technology.
How many of the above statements are correct?
Consider the following statements regarding quantum computing concepts:
1.Superposition allows a qubit to exist in both 0 and 1 states simultaneously.
2.Entanglement sudden death (ESD) refers to the gradual decay of entanglement due to environmental noise.
3.Decoherence occurs when a quantum system interacts with its surrounding environment and loses its quantum properties.
4.Quantum error correction protocols require repeated corrective operations and can themselves introduce new errors.
Which of the statements given above are correct?
Match the following quantum computing terms with their correct descriptions:
List I (Term) — List II (Description)
A.Qubit — 1. Abrupt, finite-time disappearance of entanglement
B.Decoherence — 2. Basic unit of quantum information capable of superposition
C.Entanglement sudden death — 3. Loss of quantum properties due to environmental interaction
D.Entanglement — 4. Quantum link between two particles correlated regardless of distance
Select the correct answer using the code given below:
With reference to quantum computing, consider the following statements:
1.The Majorana 1 chip uses topological qubits to reduce decoherence at the hardware level.
2.The NISQ (Noisy Intermediate-Scale Quantum) regime refers to quantum computers with 50–1,000 qubits where full fault-tolerant error correction is not yet feasible.
3.India's National Quantum Mission targets quantum computers in the NISQ regime.
Which of the statements given above are correct?
Consider the following statements regarding the Raman Research Institute (RRI) and its recent quantum research:
1.RRI is an autonomous institution under the Department of Science and Technology.
2.The QuIC laboratory at RRI demonstrated that a single, well-timed flip operation can delay or prevent entanglement sudden death.
3.The RRI team claimed to have fully replaced quantum error correction with their new technique.
4.The research was published in Physical Review A, a journal of the American Physical Society.
Which of the statements given above are correct?
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