AI Article Synopsis
- The proposed quantum swap gate allows for the exchange of quantum states between Alice and Bob, where only Alice's photon is transmitted, and the likelihood of a photon existing in the communication channel can be minimized.
- Unlike traditional counterfactual quantum communication methods that rely on numerous measurements, this protocol uses multiple phase operations to facilitate the exchange of states, functioning as a unitary time evolution operator.
- The communication is highly efficient and reliable, boasting perfect fidelity under ideal conditions, and the protocol is simpler to implement than typical counterfactual methods, with the added capability to adapt into a standard counterfactual approach.
Article Abstract
We propose a quasi-counterfactual quantum swap gate for exchanging Alice's unknown photon state and Bob's unknown atomic state under the condition that only Alice's photon may appear in the transmission channel between Alice and Bob, while the probability of the existence of photon in the transmission channel is controllable and can tend to zero. Unlike standard counterfactual quantum communication protocols, quantum states exchange in present scenario is achieved by multiple phase operations, rather than multiple measurements. The total effect of those operations can be considered as a unitary time evolution operator. Therefore, the communication fidelity and efficiency of our protocol are always one if system imperfection and channel noise are not considered. Compared to standard counterfactual communication protocols, our protocol is easy to implement. We also show that it can be easily converted to a standard counterfactual one.
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| http://dx.doi.org/10.1364/OE.27.020525 | DOI Listing |
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