Quantum Entanglement: The Building Block of Quantum Computing

Quantum entanglement. Conceptual artwork of a pair of entangled quantum particles or events (left and right) interacting at a distance. Quantum entanglement is one of the consequences of quantum theory. Two particles will appear to be linked across space and time, with changes to one of the particles (such as an observation or measurement) affecting the other one. This instantaneous effect appears to be independent of both space and time, meaning that, in the quantum realm, effect may precede cause.

A new area of technology called quantum computing has the potential to completely alter how humans process information. Quantum computers use quantum bits, or qubits, which can be in the states of 0, 1, or both simultaneously, in contrast to classical computers, which use bits that can only be either 0 or 1. The phenomenon known as quantum entanglement, which is regarded as the fundamental component of quantum computing, is the cause of this qubit feature. We shall discuss the idea of quantum entanglement communication and its significance in the advancement of quantum computing in this blog post.

What is Quantum Entanglement?

though two or more particles become correlated in a way that their properties depend on one another, even though they are separated by great distances, this phenomenon is known as quantum entanglement. This implies that regardless of their distance if you measure one particle, the state of the other particle will be instantly changed.

Let’s use the example of two entangled photons to clarify this idea. The polarization states of two entangled photons are coupled. The polarization of the other photon will be horizontal if the polarisation of the first photon is measured to be vertical, and vice versa. This instantaneous correlation between the two photons happens regardless of their separation.

Importance of Quantum Entanglement in Quantum Computing

Because it enables quantum computers to do tasks that classical computers are unable to do, quantum entanglement is a key element of quantum computing. Quantum teleportation is one of these tasks; it entails sending a qubit’s state from one place to another without actually transferring the qubit. The instantaneous transmission of information is made possible by the entanglement of two particles, which enables this process.

Quantum cryptography, a form of secure communication, is another use of quantum entanglement in quantum computing. The entangled particles are employed in quantum cryptography to produce a secure key that may be communicated between two parties without being intercepted. This is due to the fact that any effort to steal the key would result in an observable disruption of the entanglement.

In quantum algorithms like Shor’s algorithm for factoring big numbers and Grover’s algorithm for searching unstructured databases, quantum entanglement is also essential. These algorithms depend on quantum computers’ capacity to solve problems much more quickly than conventional computers by performing parallel computations on entangled qubits.

Challenges in the Development of Quantum Computing

The development of quantum computing still faces a number of obstacles despite its potential advantages. Decoherence, or the loss of coherence or entanglement between qubits as a result of their interaction with the environment, is one of the major problems. Decoherence can hinder the usage of more qubits in quantum computers and lead to errors in quantum operations.


The complexity of producing and managing entangled particles is another obstacle in the development of quantum computing. Due to their fragility and ease of decohesion, entangled particles need to be carefully managed and controlled.


A key idea in quantum computing is quantum entanglement, which enables quantum computers to carry out operations that are impossible for classical computers to carry out. It serves as the basis for quantum teleportation, quantum cryptography, and quantum algorithms and has the potential to completely alter industries including finance, drug discovery, and encryption. Decoherence and the complexity of producing and managing entangled particles are just two of the difficulties that remain in the development of quantum computing. Despite this, quantum entanglement is still a fascinating and exciting area of study that continues to excite researchers and technologists everywhere.

Adil Husnain

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