Classical Half-Adder using Trapped-ion Quantum Bits: Towards Energy-efficient Computation · HackerPapers discussions

Classical Half-Adder using Trapped-ion Quantum Bits: Towards Energy-efficient Computation — mentioned by sgdpk

Sun, 17 Mar 2024 00:21:00 GMT

I have worked on this aspect on quantum computation [1]. The main problem is that reversibility is a feature of isolated quantum systems. In practice, they are not isolated. Why? It's not just because of small interactions with the environment that we cannot control. It's that even the apparatuses that we use to control/drive the logical instructions (lasers, electrical transmission lines) should be taken into account if the computer is to be considered isolated. But usually they aren't, and this leads to inevitable losses of reversiblity in the data register. In other words, unitary…

Paper and discussion history. A mention is not an endorsement.

Classical Half-Adder using Trapped-ion Quantum Bits: Towards Energy-efficient Computation — mentioned by sgdpk

Sun, 28 May 2023 22:54:38 GMT

Inspired by this, in my PhD we actually used a quantum computer to do classical logic to investigate if that can lead to energy savings [1]. Quantum machines are (in principle) reversible, so they may avoid Landauer's principle. However, there are subtle energy costs that you can hit before getting to Landauer's. The most interesting to me is that the qubits can become entangled with the wires that control them! This reduces the quality of information, and one way around it is to use a lot of energy [2]. [1] https://arxiv.org/abs/2210.10470 [2]…

Paper and discussion history. A mention is not an endorsement.