Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Felix A Pollock"'
Publikováno v:
New Journal of Physics, Vol 24, Iss 6, p 065001 (2022)
Recent advances in quantum resource theories have been driven by the fact that many quantum information protocols make use of different facets of the same physical features, e.g. entanglement, coherence, etc. Resource theories formalise the role of t
Externí odkaz:
https://doaj.org/article/18baab17cec946aa9f901e7f3a2cb795
Autor:
Pietro Liuzzo-Scorpo, Luis A Correa, Felix A Pollock, Agnieszka Górecka, Kavan Modi, Gerardo Adesso
Publikováno v:
New Journal of Physics, Vol 20, Iss 6, p 063009 (2018)
The problem of estimating the frequency of a two-level atom in a noisy environment is studied. Our interest is to minimise both the energetic cost of the protocol and the statistical uncertainty of the estimate. In particular, we prepare a probe in a
Externí odkaz:
https://doaj.org/article/afd553a5516a42c38ac6511219082cd6
Publikováno v:
New Journal of Physics, Vol 20, Iss 3, p 033033 (2018)
Quantum mechanics, in principle, allows for processes with indefinite causal order. However, most of these causal anomalies have not yet been detected experimentally. We show that every such process can be simulated experimentally by means of non-Mar
Externí odkaz:
https://doaj.org/article/cc5f3152198e4691a96279433ed9cd87
Autor:
Agnieszka Górecka, Felix A Pollock, Pietro Liuzzo-Scorpo, Rosanna Nichols, Gerardo Adesso, Kavan Modi
Publikováno v:
New Journal of Physics, Vol 20, Iss 8, p 083008 (2018)
We consider frequency estimation in a noisy environment with noisy probes. This builds on previous studies, most of which assume that the initial probe state is pure, while the encoding process is noisy, or that the initial probe state is mixed, whil
Externí odkaz:
https://doaj.org/article/65e68bcb3ddb4150a3ff6eac8f59b8e8
Publikováno v:
New Journal of Physics, Vol 15, Iss 7, p 075018 (2013)
Unitary transformations can allow one to study open quantum systems in situations for which standard, weak-coupling type approximations are not valid. We develop here an extension of the variational (polaron) transformation approach to open system dy
Externí odkaz:
https://doaj.org/article/f84b75894029425ca364d86e83111ad5
Publikováno v:
npj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
Abstract Generic non-Markovian quantum processes have infinitely long memory, implying an exact description that grows exponentially in complexity with observation time. Here, we present a finite memory ansatz that approximates (or recovers) the true
Externí odkaz:
https://doaj.org/article/79ac096af5c3405dad332fb938fe9edd
Publikováno v:
Communications Physics, Vol 4, Iss 1, Pp 1-11 (2021)
A question of foundational importance is ‘w h y i s n a t u r e f o r g e t f u l?’, playing an important role in our understanding of thermodynamics. Here, the authors study a class of quantum processes, called approximate unitary designs, to sh
Externí odkaz:
https://doaj.org/article/7138a0f2d6e042719c90cc8d87f1d863
Publikováno v:
SciPost Physics, Vol 13, Iss 2, p 027 (2022)
We present a theory of modified reduced dynamics in the presence of counting fields. Reduced dynamics techniques are useful for describing open quantum systems at long emergent timescales when the memory timescales are short. However, they can be
Externí odkaz:
https://doaj.org/article/98a2d6d5746343dea13c5a2e9e7694b5
Publikováno v:
PRX Quantum, Vol 3, Iss 2, p 020354 (2022)
We demonstrate that it is possible to effectively eliminate radiative losses during excitonic energy transport in systems with an intrinsic energy gradient. By considering chainlike systems of repeating “unit” cells that can each consist of multi
Externí odkaz:
https://doaj.org/article/0d235cb624204a4cae6aed16d4f0e1d5
Publikováno v:
SciPost Physics, Vol 10, Iss 6, p 141 (2021)
While spatial quantum correlations have been studied in great detail, much less is known about the genuine quantum correlations that can be exhibited by temporal processes. Employing the quantum comb formalism, processes in time can be mapped onto
Externí odkaz:
https://doaj.org/article/c571251a34564cb18cdb278c5c26b093