• Quantum computers can sometimes computer without “running.” The computer, which stays in its “off” subspace for the entire computation, can sometimes demonstrate results. Previously, this process has had an upper efficiency limit of 50 percent, but now it’s 85 percent with the potential to reach 100 percent.
  • “For each repetition, we prepare the quantum switch into a quantum superposition state, including two coherent parts (‘on’ and ‘off’). Then the ‘algorithm,’ a NOT gate on the quantum register in our case, is performed in the ‘on’ subspace. Although it seems the computer has run in this step, a consequent projective measurement will remove all the changes in the ‘on’ subspace, since the probability of the whole system collapsing into the ‘off’ subspace during the measurement is very large (approaches 100% as the number of repetitions tends to infinity utilizing the quantum Zeno effect),” explained one researcher.
  • This discovery could open the door for potential applications for counterfactual computing, which include quantum cryptography and secure communication.

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