Analysis of information sources in references of the Wikipedia article "Elitzur–Vaidman bomb tester" in English language version.
Specifically, even if the occupation number of a mode is 0, there are two possible values that its discrete phase might take, and hence such a mode can still encode one bit of information. This is what opens up the possibility that information about a device (e.g., whether it implements a which-way measurement or not) can be propagated to other devices (such as the final detectors) through a mode which, in the quantum account, is in the vacuum quantum state. In particular, in the case of the Elitzur-Vaidman bomb-tester, it is what opens up the possibility that information about whether the bomb is functional or faulty can be propagated to the final detectors through the physical state of the R mode even though in the quantum account the R mode is in the vacuum quantum state.
Specifically, even if the occupation number of a mode is 0, there are two possible values that its discrete phase might take, and hence such a mode can still encode one bit of information. This is what opens up the possibility that information about a device (e.g., whether it implements a which-way measurement or not) can be propagated to other devices (such as the final detectors) through a mode which, in the quantum account, is in the vacuum quantum state. In particular, in the case of the Elitzur-Vaidman bomb-tester, it is what opens up the possibility that information about whether the bomb is functional or faulty can be propagated to the final detectors through the physical state of the R mode even though in the quantum account the R mode is in the vacuum quantum state.
Specifically, even if the occupation number of a mode is 0, there are two possible values that its discrete phase might take, and hence such a mode can still encode one bit of information. This is what opens up the possibility that information about a device (e.g., whether it implements a which-way measurement or not) can be propagated to other devices (such as the final detectors) through a mode which, in the quantum account, is in the vacuum quantum state. In particular, in the case of the Elitzur-Vaidman bomb-tester, it is what opens up the possibility that information about whether the bomb is functional or faulty can be propagated to the final detectors through the physical state of the R mode even though in the quantum account the R mode is in the vacuum quantum state.
Specifically, even if the occupation number of a mode is 0, there are two possible values that its discrete phase might take, and hence such a mode can still encode one bit of information. This is what opens up the possibility that information about a device (e.g., whether it implements a which-way measurement or not) can be propagated to other devices (such as the final detectors) through a mode which, in the quantum account, is in the vacuum quantum state. In particular, in the case of the Elitzur-Vaidman bomb-tester, it is what opens up the possibility that information about whether the bomb is functional or faulty can be propagated to the final detectors through the physical state of the R mode even though in the quantum account the R mode is in the vacuum quantum state.
Specifically, even if the occupation number of a mode is 0, there are two possible values that its discrete phase might take, and hence such a mode can still encode one bit of information. This is what opens up the possibility that information about a device (e.g., whether it implements a which-way measurement or not) can be propagated to other devices (such as the final detectors) through a mode which, in the quantum account, is in the vacuum quantum state. In particular, in the case of the Elitzur-Vaidman bomb-tester, it is what opens up the possibility that information about whether the bomb is functional or faulty can be propagated to the final detectors through the physical state of the R mode even though in the quantum account the R mode is in the vacuum quantum state.
