A consistent quantum model for continuous photodetection processes

Oliveira, M. C. de; Mizrahi, S. S.; Dodonov, V. V.

doi:10.1088/1464-4266/5/3/358

Cited by 26 publications

(43 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, instead of the group-theoretic approach one can generalize coherent states as the eigenstates of the lowering operator at hand. One common example arising in different physical situations [53][54][55][56] is the use of bare raising and lowering operators, also called exponential phase operators, or Susskind-Glogower operators. The bare raising and lowering operators are given respectively by l − = ∞ n=0 |n n + 1|, l + = ∞ n=0 |n + 1 n|, with commutation relation [l − , l + ] = |0 0|.…”

Section: S4 An Alternate Generalization Of Coherent Statesmentioning

confidence: 99%

Converting Nonclassicality into Entanglement

Killoran¹,

Steinhoff²,

Plenio³

2016

Phys. Rev. Lett.

195

199

View full text Add to dashboard Cite

Quantum mechanics exhibits a wide range of non-classical features, of which entanglement in multipartite systems takes a central place. In several specific settings, it is well-known that nonclassicality (e.g., squeezing, spin-squeezing, coherence) can be converted into entanglement. In this work, we present a general framework, based on superposition, for structurally connecting and converting non-classicality to entanglement. In addition to capturing the previously known results, this framework also allows us to uncover new entanglement convertibility theorems in two broad scenarios, one which is discrete and one which is continuous. In the discrete setting, the classical states can be any finite linearly independent set. For the continuous setting, the pertinent classical states are 'symmetric coherent states,' connected with symmetric representations of the group SU (K). These results generalize and link convertibility properties from the resource theory of coherence, spin coherent states, and optical coherent states, while also revealing important connections between local and non-local pictures of non-classicality.Quantum mechanics currently provides our deepest description of nature. Despite this, much of our everyday experience can be accurately captured within a classical description. What is special about the nonclassical states of a physical system, and what distinguishes them from the more commonplace classical states? Certainly, one of the most important manifestations of non-classicality is entanglement of multipartite systems. Schrödinger even viewed entanglement as "the characteristic trait of quantum mechanics" [1]. Yet there are situations where entanglement has no natural role in describing non-classicality, such as Fock states in optics [2]. Particularly for non-composite systems, other notions of non-classicality appear better suited for characterizing quantum states.A key aspect where quantum mechanics departs from classical mechanics is the prominence of the superposition principle. This elementary tenet of quantum theory supplies a very general framework for categorizing classical and non-classical states. Depending on the particular setting, we may specify some important subset of pure states {|c } c∈I to be the 'classical' pure states of the system. We can then directly associate non-classicality with superposition: a state |ψ is non-classical if and only if it is a non-trivial superposition of classical states. In fact, entanglement fits naturally within this superposition framework, by specifying factorized states as the classical states.One famous example of classical states is that of optical coherent states, {|α } α∈C [2][3][4]. A completely different example is found in the resource theories of coherence [5] or reference frames [6], where the classical states are some fixed orthonormal basis {|k } M k=0 . In both examples, there is no distinction of subsystems, and entanglement is not obviously relevant. Nevertheless, there are fundamental connections between these single-system c...

show abstract

Section: S4 An Alternate Generalization Of Coherent Statesmentioning

confidence: 99%

Converting Nonclassicality into Entanglement

Killoran¹,

Steinhoff²,

Plenio³

2016

Phys. Rev. Lett.

195

199

View full text Add to dashboard Cite

show abstract

“…The unconditioned time evolution (UTE) of the field in the presence of the detector, i.e. the evolution when the detector is turned on but the outcomes of the measurements are disregarded (not registered), is described by the master equation [18,22,34] …”

Section: Models Of Non-ideal Photodetectorsmentioning

confidence: 99%

“…CPM is extensively discussed in the literature [3,18,32,33,34], so we shall mention only its main properties. The model, also referred as a theory, describes the field state evolution during the photodetection process in a closed cavity and is formulated in terms of two fundamental operations, assumed to represent the only events taking place at each infinitesimal time interval.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inclusion of nonidealities in the continuous photodetection model

2007

View full text Add to dashboard Cite

Some non-ideal effects as non-unit quantum efficiency, dark counts, dead time and cavity losses that occur in experiments are incorporated within the continuous photodetection model by using the analytical quantum trajectories approach. We show that in standard photocounting experiments the validity of the model can be verified, and the formal expression for the quantum jump superoperator can also be checked.

show abstract

“…Continuous photodetection model (CPM) [3,5,7,11,12] describes the field state evolution during the photodetection process in a closed cavity and is formulated in terms of two fundamental operations, assumed to represent the only events occurring at each infinitesimal time interval. (1) The one-count operation, represented by the Quantum Jump Superoperator (QJS), describes the detector's back-action on the field upon a single count, and the trace calculation over the QJS gives the probability per unit time for occurrence of a detection.…”

Section: Introductionmentioning

confidence: 99%

Quantum model for continuous photodetection

Mizrahi¹,

Додонов²,

Dodonov³

et al. 2008

AIP Conference Proceedings

View full text Add to dashboard Cite

We examine some aspects of the continuous photodetection model for photocounting processes in cavities. We work out a microscopic model that describes the field-detector interaction and deduce a general expression for the Quantum Jump Superoperator (QJS), that shapes the detector's post-action on the field upon a detection. We show that in particular cases our model recovers the QJSs previously proposed ad hoc in the literature and point out that by adjusting the detector parameters one can engineer QJSs.

show abstract

A consistent quantum model for continuous photodetection processes

Cited by 26 publications

References 66 publications

Converting Nonclassicality into Entanglement

Converting Nonclassicality into Entanglement

Inclusion of nonidealities in the continuous photodetection model

Quantum model for continuous photodetection

Contact Info

Product

Resources

About