Quantum Physics


Observation Noise

Authors: Masataka Ohta

When a qubit interacts with environment, it may, instead of lose coherence, be observed. As is well known in quantum cryptography, such observation destroys entangled state causing noise, in this letter, called “observation noise”. As quantum error correction fundamentally depends on entangled states, the observation noise makes error correction impossible. As such, quantum computation with practically large quantum parallelism is impossible. Classical computers are better than quantum ones.

Comments: 3 Pages.

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[v1] 2018-10-29 22:36:02

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