講演抄録/キーワード |
講演名 |
2012-11-27 15:40
Dimension Witnesses and Semi-Device-Independent Quantum Protocols in the presence of Loss ○Michele Dall'Arno(Nagoya Univ.)・Elsa Passaro・Rodrigo Gallego(ICFO)・Marcin Pawlowski(Bristol Univ.)・Antonio Acin(ICFO) |
抄録 |
(和) |
Device independent dimension witnesses (DIDWs) provide a lower bound on the dimensionality of classical and quantum systems in a "black box" scenario where only correlations between preparations, measurements and outcomes are considered. Building on the framework of DIDWs, recently several semi-device independent (SDI) quantum protocols were proposed - e.g. for secure key distribution, random access coding, and randomness generation - in a scenario where no assumption on the internal working of the devices is made, except their dimension. These protocols, while being often more practical than fully-device independent ones, are also clearly more secure than their device dependent counterparts. We review previous results on the performance of DIDWs and the security of SDI protocols in the presence of loss. First, we address the problem of the robustness of dimension witnesses, namely that to witness the dimension of a system or to discriminate between its quantum or classical nature, even in the presence of loss. We consider the case when shared randomness is allowed between preparations and measurements and provide a threshold in the detection efficiency such that dimension witnessing can still be performed. Then, we discuss conditions under which detection inefficiencies can be exploited to fake the result of a SDI protocol - and how to prevent it - in terms of the detection probability and of the worst case success probability of a random access code. |
(英) |
Device independent dimension witnesses (DIDWs) provide a lower bound on the dimensionality of classical and quantum systems in a "black box" scenario where only correlations between preparations, measurements and outcomes are considered. Building on the framework of DIDWs, recently several semi-device independent (SDI) quantum protocols were proposed - e.g. for secure key distribution, random access coding, and randomness generation - in a scenario where no assumption on the internal working of the devices is made, except their dimension. These protocols, while being often more practical than fully-device independent ones, are also clearly more secure than their device dependent counterparts. We review previous results on the performance of DIDWs and the security of SDI protocols in the presence of loss. First, we address the problem of the robustness of dimension witnesses, namely that to witness the dimension of a system or to discriminate between its quantum or classical nature, even in the presence of loss. We consider the case when shared randomness is allowed between preparations and measurements and provide a threshold in the detection efficiency such that dimension witnessing can still be performed. Then, we discuss conditions under which detection inefficiencies can be exploited to fake the result of a SDI protocol - and how to prevent it - in terms of the detection probability and of the worst case success probability of a random access code. |
キーワード |
(和) |
device independent dimension witnesses / semi-device-independent protocols / quantum efficiency / detection loophole / / / / |
(英) |
device independent dimension witnesses / semi-device-independent protocols / quantum efficiency / detection loophole / / / / |
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