Quantum illumination with a generic Gaussian source

Karsa, Athena; Spedalieri, Gaetana; Zhuang, Quntao; Pirandola, Stefano

doi:10.1103/physrevresearch.2.023414

Cited by 69 publications

(57 citation statements)

References 35 publications

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“…The diagonalizing symplectic is required in order to find the quantum Chernoff bound [4] for Gaussian states [5]. This can then be used to approximate the trace norm bound on state discrimination, and has applications in quantum illumination [6,7] and quantum reading [8], among other fields [1]. The diagonalizing symplectic is also useful for finding the optimal measurement to discriminate between Gaussian states [9].…”

Section: Introductionmentioning

confidence: 99%

Symplectic decomposition from submatrix determinants

2021

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An important theorem in Gaussian quantum information tells us that we can diagonalize the covariance matrix of any Gaussian state via a symplectic transformation. While the diagonal form is easy to find, the process for finding the diagonalizing symplectic can be more difficult, and a common, existing method requires taking matrix powers, which can be demanding analytically. Inspired by a recently presented technique for finding the eigenvectors of a Hermitian matrix from certain submatrix eigenvalues, we derive a similar method for finding the diagonalizing symplectic from certain submatrix determinants, which could prove useful in Gaussian quantum information.

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Section: Introductionmentioning

confidence: 99%

Symplectic decomposition from submatrix determinants

2021

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“…Moreover, many people immediately imagine quantum radar as a long-range surveillance radar with a range of hundreds of kilometres, whereas such an application of quantum radar seems unlikely [247,248]. Such an optimal, long-term surveillance quantum radar would be extremely expensive (many orders of magnitude higher than the classical radar cost for any range) [247], and it would still not fulfil all the advantages and features listed above.…”

Section: Quantum Radar and Lidarmentioning

confidence: 99%

Quantum technology for military applications

Krelina

2021

EPJ Quantum Technol.

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Quantum technology is an emergent and potentially disruptive discipline, with the ability to affect many human activities. Quantum technologies are dual-use technologies, and as such are of interest to the defence and security industry and military and governmental actors. This report reviews and maps the possible quantum technology military applications, serving as an entry point for international peace and security assessment, ethics research, military and governmental policy, strategy and decision making. Quantum technologies for military applications introduce new capabilities, improving effectiveness and increasing precision, thus leading to ‘quantum warfare’, wherein new military strategies, doctrines, policies and ethics should be established. This report provides a basic overview of quantum technologies under development, also estimating the expected time scale of delivery or the utilisation impact. Particular military applications of quantum technology are described for various warfare domains (e.g. land, air, space, electronic, cyber and underwater warfare and ISTAR—intelligence, surveillance, target acquisition and reconnaissance), and related issues and challenges are articulated.

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“…In fact, there may be some specific receiver design (measurement) that allows a quantum protocol to achieve a lower error rate than is given by the upper bound in Eq. (6). For the bipartite entangled protocol, such a receiver design is known: the CN receiver of Ref.…”

Section: Application To Position-based Quantum Readingmentioning

confidence: 99%

“…An important case of CPF is locating a (bosonic) thermal loss channel with a different transmissivity or induced noise amongst a sequence of background lossy channels. This is a task with applications in quantum illumination [5][6][7], spectroscopy [8,9], and quantum reading [10,11]. In quantum illumination, one may know that a target is present in one of several locations but not know where.…”

Section: Introductionmentioning

confidence: 99%

Idler-free channel position finding

et al. 2021

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Entanglement is a powerful tool for quantum sensing, and entangled states can greatly boost the discriminative power of protocols for quantum illumination, quantum metrology, or quantum reading. However, entangled state protocols generally require the retention of an idler state, to which the probes are entangled. Storing a quantum state is difficult and so technological limitations can make protocols requiring quantum memories impracticable. One alternative is idler-free protocols that utilise non-classical sources but do not require any idler states to be stored. Here we apply such a protocol to the task of channel position finding. This involves finding a target channel in a sequence of background channels, and has many applications, including quantum sensing, quantum spectroscopy, and quantum reading.

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Quantum illumination with a generic Gaussian source

Cited by 69 publications

References 35 publications

Symplectic decomposition from submatrix determinants

Symplectic decomposition from submatrix determinants

Quantum technology for military applications

Idler-free channel position finding

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