Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environment

Hu, Li-Yun; Zhang, Zhiming

doi:10.1364/josab.29.000529

Cited by 36 publications

(19 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(11) and (12) that both the conditions g ð2Þ ! 2 and NRF 1, indicating non-classicality of the generated¯eld can be ful¯lled only when f T 1.…”

Section: Resultsmentioning

confidence: 99%

“…6 PDC-generated correlated photon pairs of signal and idler frequencies can form one-mode or two-mode squeezed vacuum¯elds, 7,8 the single-photon states are obtained using spontaneous PDC (SPDC) and principle of conditional post-selection. 9 Also achieved are di®erent types of single-photon-added states 10,11 in parametric converters and ampli¯ers. At the same time, even under the pure optical pumping, frequency of one photon of each pair can¯t the terahertz range.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generation of optical-terahertz biphoton pairs via spontaneous parametric down-conversion

Kornienko

Germanskiy

Китаева

et al. 2014

Int. J. Quantum Inform.

View full text Add to dashboard Cite

We examine the features of parametric down-conversion for generating non-classical opticalterahertz biphoton¯elds. The calculations were performed for a second-order correlation function and noise reduction factor (NRF), which were selected as measures of non-classicality of the¯eld states. NRF measurement schemes were found to be less advantageous.Overall system temperature at which non-classical e®ects are still observable has been estimated as about 10 K. The priority of the main complicating factors for the quantum-optical measurements in the terahertz range has been determined. Thus, the most important parameter is the temperature of the system, after that come the absorption losses at terahertz frequencies, and the parametric conversion e±ciency has the lowest impact. Increasing the pump radiation power has been found to be ine±cient for \noise" suppression in this case. The calculations performed were based on lithium niobate dispersion properties due to its outstanding nonlinear optical properties and because it is frequently used for optical-toterahertz frequency conversion.

show abstract

“…(11) and (12) that both the conditions g ð2Þ ! 2 and NRF 1, indicating non-classicality of the generated¯eld can be ful¯lled only when f T 1.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation of optical-terahertz biphoton pairs via spontaneous parametric down-conversion

Kornienko

Germanskiy

Китаева

et al. 2014

Int. J. Quantum Inform.

View full text Add to dashboard Cite

show abstract

“…Recently, we proposed the any photon-added squeezed thermal state theoretically, and investigated its nonclassicality by exploring the sub-Poissonian and negative Wigner function (WF) [23]. The results show that the WF of single photon-added squeezed thermal state (PASTS) always has negative values at the phase space center.…”

Section: Introductionmentioning

confidence: 99%

Entanglement and nonclassicality of photon-added two-mode squeezed thermal state

Jia

Zhang

2012

J. Opt. Soc. Am. B

Self Cite

View full text Add to dashboard Cite

We introduce a kind of entangled state-photon-addition two-mode squeezed thermal state (TM-STS) by adding photons to each mode of the TMSTS. Using the P-representation of thermal state, the compact expression of the normalization factor is derived, a Jacobi polynomial. The nonclassicality is investigated by exploring especially the negativity of Wigner function. The entanglement is discussed by using Shchukin-Vogel criteria. It is shown that the photon-addtion to the TMSTS may be more effective for the entanglement enhancement than the photon-subtraction from the TMSTS. In addition, the quantum teleportation is also examined, which shows that symmetrical photon-added TMSTS may be more useful for quantum teleportation than the non-symmetric case. PACS number(s): 42.50.Dv, 03.65.Wj, 03.67.Mn

show abstract

“…Furthermore, the non-Gaussianity of NGSs is crucial for realizing quantum error correction [5], entanglement distillation [6,7], and cluster states quantum computation [8,9]. Up to now, a number of approaches have been proposed theoretically to produce single-or twomode NGSs [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Among them, the operation of photon addition or subtraction on traditional Gaussian states is a very useful technique, as the NGSs produced with it often exhibit significantly different physical properties from the original states and from each other.…”

Section: Introductionmentioning

confidence: 99%

“…(5) and (7), as will be shown later. Third, as an entangled two-mode NGS (with the presence of a two-mode squeezing operation resulting in the distribution of entanglement), the PTSTS completely differs from the direct product of two photon-added single-mode squeezed thermal states (PSSTSs) [17], and is thus not a simple extension of the single-mode case since the generalization can lead to some new physical insights. Finally, up to now much experimental effort is being directed at realizing CV quantum protocols (including entanglement-assisted coding, entanglement distillation, and quantum teleportation) using only several simple pure Gaussian states.…”

Section: Introductionmentioning

confidence: 99%

Nonclassical properties of photon-added two-mode squeezed thermal states and their decoherence in the thermal channel

et al. 2012

View full text Add to dashboard Cite

We investigate nonclassicality and decoherence of field states generated with the non-Gaussian operation of photon addition to a two-mode squeezed thermal state (TSTS) using the normally ordered density operator of the photon-added TSTS (PTSTS). The normalization factor of the PTSTS is just a Jacobi polynomial of the squeezing parameter γ and the average photon numbern of the thermal field. We show that the fields in such states exhibit remarkable quantum features, such as sub-Poissonian photon statistics, the anti-bunching effect, and photon-number distribution. The nonclassicality is discussed in phase space based on the partial negativity of the Wigner function (WF) with two-variable Hermite polynomials. The results show that the non-Gaussian WF always exhibits the quantum interference structure caused by the two-mode squeezing operation and has some negative regions for any value ofn, γ, and the photon-addition numbers m, n. In addition, the effect of decoherence on the PTSTS in the thermal channel is studied by analytically deriving the time-evolution WF. We find that the WF becomes Gaussian (corresponding to a classical thermal state) at long times, losing its nonclassicality as a result of decoherence, and a larger m (or n) leads to a longer decoherence time κt.

show abstract

Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environment

Cited by 36 publications

References 44 publications

Generation of optical-terahertz biphoton pairs via spontaneous parametric down-conversion

Generation of optical-terahertz biphoton pairs via spontaneous parametric down-conversion

Entanglement and nonclassicality of photon-added two-mode squeezed thermal state

Nonclassical properties of photon-added two-mode squeezed thermal states and their decoherence in the thermal channel

Contact Info

Product

Resources

About