Browsing by Author "Devendra Kumar Mishra"

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Broadening the high sensitivity range of squeezing-assisted interferometers by means of two-channel detection
(OSA - The Optical Society, 2021) Gaurav Shukla; Dariya Salykina; Gaetano Frascella; Devendra Kumar Mishra; Maria V. Chekhova; Farit Ya. Khalili
For a squeezing-enhanced linear (so-called SU(2)) interferometer, we theoretically investigate the possibility to broaden the phase range of sub-shot-noise sensitivity. We show that this goal can be achieved by implementing detection in both output ports, with the optimal combination of the detectors outputs. With this modification, the interferometer has the phase sensitivity independent of the interferometer operation point and, similar to the standard dark port regime, is not affected by the laser technical (excess) noise. Provided that each detector is preceded by a phase-sensitive amplifier, this sensitivity could be also tolerant to the detection loss. © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Comparative study of squeezing-assisted Mach–Zehnder interferometer under homodyne, product detection and first-order correlation measurements
(Springer, 2025) Anand Kumar; Gaurav Shukla; Devendra Kumar Mishra
Precision measurement plays an important role in the field of quantum metrology. Choosing an appropriate measurement scheme improves measurement outcomes. Homodyne detection schemes, product detection schemes and correlation measurement schemes are the detection schemes that provide better information than the intensity detection schemes. Here, we compare the performance of all three detection schemes on a squeezing-assisted Mach–Zehnder interferometer in real scenarios. This comparison helps in the application of quantum sensing. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.
Dark matter annual modulation analysis with combined nuclear and electron recoil channels
(American Physical Society, 2025) Haubin Li; Mukesh Kumar Pandey; C. H. Leung; Lakhwinder Singh; Henry Tsz King Wong; Hsinchang Chi; Muhammed Deniz; C. Greeshma; Jiunn Wei Chen; H. C. Hsu; Sevgi Karadaǧ; S. Karmakar; V. Kumar; Jin Li; Fong Kay Lin; Shinted Lin; Chengpang Liu; Shukui Liu; Hao Ma; Devendra Kumar Mishra; Kapil Saraswat; Vivek Sharma; Manoj Kumar Singh; Venktesh Singh; D. Tanabe; Jiashian Wang; Chihpan Wu; Litao Yang; C. H. Yeh; Qian Yue
After decades of experimental efforts, the DAMA/LIBRA(DL) annual modulation (AM) analysis on the χN (WIMP dark matter interactions on nucleus) channel remains the only one which can be interpreted as positive signatures. This has been refuted by numerous time-integrated (TI) and AM analysis. It has been shown that χe (WIMP interactions with electrons) alone is not compatible with the DL AM data. We expand the investigations by performing an AM analysis with the addition of χe long-range and short-range interactions to χN, derived using the frozen core approximation method. Two scenarios are considered, where the χN and χe processes are due to a single χ (Γtot1χ) or two different χ's (Γtot2χ). The combined fits with χN and χe provide stronger significance to the DL AM data which are compatible with the presence of additional physical effects beyond χN alone. This is the first analysis which explores how χe AM can play a role in DL AM. The revised allowed regions as well as the exclusion contours from the other null AM experiments are presented. All DL AM allowed parameter spaces in χN and χe channels under both Γtot1χ and Γtot2χ are excluded at the 90% confidence level by the combined null AM results. It can be projected that DL-allowed parameter spaces from generic models with interactions induced by two-WIMPs are ruled out. © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
Effect of Tritter on the Amplitude-Squared Squeezing of Light
(Springer Science and Business Media Deutschland GmbH, 2021) Dhiraj Yadav; Devendra Kumar Mishra
We study the effect of a tritter (a linear circuit of three beam splitters) on the ‘Amplitude-Squared Squeezing (ASS)’. We study the variation of ASS with different parameters of tritter and find that there are a number of situations where ASS is enhanced at output of the tritter when we inject light beam exhibiting ASS at one input port and light beams in coherent state at another two input ports of the tritter. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Enhancement in phase sensitivity of SU(1,1) interferometer with Kerr state seeding
(Elsevier B.V., 2024) Priyanka Sharma; Aviral Kumar Pandey; Gaurav Shukla; Devendra Kumar Mishra
A coherent seeded SU(1,1) interferometer provides a prominent technique in precision measurement. We theoretically study the phase sensitivity of SU(1,1) interferometer with Kerr state seeding under single intensity and homodyne detection schemes. To find the lower bound in this case we calculate the quantum Cramér–Rao bound using the quantum Fisher information technique. We found that, under some conditions, the Kerr seeding performs better in phase sensitivity compared to the well-known vacuum and coherent seeded case. We expect that the Kerr state might act as an alternative non-classical state in the field of quantum information and sensing technologies. © 2024 Elsevier B.V.
Enhancement in sensitivity of coherent anti-Stokes Raman spectroscopy via SU(1,1) interferometry
(Springer Science and Business Media Deutschland GmbH, 2025) Taj Kumar; Gaurav Shukla; Devendra Kumar Mishra
The sensitivity of coherent anti-Stokes Raman spectroscopy (CARS) is limited by the shot-noise from the probe fields used for stimulation and the non-resonant background noise. We have investigated the performance of the squeezing-enhanced version of CARS under homodyne detection and sum-intensity detection schemes, compared with the shot-noise limit (SNL) and quantum Cramér-Rao bound (QCRB). Our analysis shows homodyne detection performs better than sum-intensity and known single-intensity detection scheme results. It also provides a broader working range and shows more robustness against internal photon losses and remarkably improved performance in the gain-imbalanced configuration of SU(1,1) interferometer. As a result, we expect that our findings will be useful in quantum sensing and imaging techniques. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.
Enhancement of amplitude-squared squeezing of light with the SU(3) multiport beam splitters
(Springer, 2021) Dhiraj Yadav; Karunesh Kumar Mishra; Gaurav Shukla; Devendra Kumar Mishra
We study the effect of a tritter, a linear optical circuit of three beam splitters following SU(3) unitary group transformations having three inputs and three output ports, on the ‘Amplitude-Squared Squeezing (ASS)’. We study the variation of ASS with different parameters of the tritter and find that there are a number of conditions where ASS is enhanced at the output of the tritter when we inject light beam exhibiting ASS at one of the input port and light beams in coherent state at another two input ports of the tritter. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.
Enhancement of angular displacement measurement sensitivity by modified-SU(2) interferometry
(SPIE, 2023) Karunesh Kumar Mishra; Priyanka Sharma; Devendra Kumar Mishra
In this paper, we analysis the angular displacement measurements using the homodyne detection scheme in a modified-SU(2) Mach-Zehnder interferometer (MZI). Three parametric amplifiers (PAs) are used in order to increase the number of photons and to reduce the shot-noise. We also consider quantum Fisher information (QFI) and derive expressions for single- and two-parameter cases and corresponding quantum Cramér-Rao bounds (QCRB). We find that angular displacement sensitivity exceeds the standard quantum limit (SQL) or shot-noise limit (SNL) and approaches single- and two-parameter QCRB. Finally, we look at the impact of photon losses on the sensitivity of interferometer. © 2023 SPIE.
Entanglement of the Non-Gaussian Two-Mode Quantum Vortex State
(Springer, 2020) Vikram Singh; Devendra Kumar Mishra
We study the entanglement properties of a non-Gaussian two-mode vortex state that was theoretically proposed by Agarwal [New J Phys 13:073008 (2011)] by using the technique of photon subtraction from a two-mode squeezed state and detection of one photon by a single-photon detector. There are different conditions to quantify the entanglement of non-classical states. We compare the entanglement conditions for this state in terms of the Hillery–Zubairy (HZ) criterion, Hillery–Dung–Zhong (HDZ) criterion, Shchukin–Vogel (SV) criterion, and Duan–Giedke–Cirac–Zoller (DGCZ) criterion. We confirm that this non-Gaussian state shows strong entanglement under these different conditions, thus suggesting that this state may have potential applications in quantum information processing. © 2019, The National Academy of Sciences, India.
Fourth-Order Sub-Poissonian Light Generation by the Beam Splitter with Second-Order Nonlinearity
(Springer, 2020) Devendra Kumar Mishra; Vikram Singh
Prakash and Mishra (J Opt Soc Am B 33(7):1552, 2016) proposed the quantum model of a ‘beam splitter with second-order nonlinearity (BSSN)’ and showed that non-classical features such as squeezing and ‘sub-Poissonian photon statistics’ of optical fields can be generated by injecting coherent light beams at their inputs. We will explore the possibilities of generation of higher-order sub-Poissonian light by using BSSN in the present paper. © 2019, The National Academy of Sciences, India.
Generation of sum- and difference-squeezing by the beam splitter having third-order nonlinear material
(Springer, 2020) Karunesh Kumar Mishra; Gaurav Shukla; Dhiraj Yadav; Devendra Kumar Mishra
We study the possibilities of generation of bimodal version of the higher-order squeezing, sum- and difference-squeezing by using the ‘beam splitter of materials having third-order nonlinearity (BSTN)’. We find that these higher-order squeezing can be generated by using this BSTN under different conditions. As a simplest case, we inject light with coherent state at one input port and the vacuum at another input port and our analysis shows the generation of sum- and difference-squeezing at the output port of BSTN. In this way, this BSTN acts as a novel quantum device to generate the radiation exhibiting sum- and difference-squeezing. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
Hong and Mandel fourth-order squeezing generated by the beam splitter with third-order nonlinearity from the coherent light
(Springer, 2020) Devendra Kumar Mishra; Vikram Singh
We study about the generation of Hong and Mandel fourth-order squeezing by the beam splitter with the third-order nonlinearity. We find that when we mix coherent light beam (a state which lies at the boundary of classical to non-classical region), we find situations where the output beam exhibit Hong and Mandel fourth-order squeezing. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
Improvement in phase-sensitivity of a Mach–Zehnder interferometer with the superposition of Schrödinger’s cat-like state with vacuum state as an input under parity measurement
(Springer, 2023) Gaurav Shukla; Krishna Mohan Mishra; Aviral Kumar Pandey; Taj Kumar; Hemendra Pandey; Devendra Kumar Mishra
We study the improvement in the phase sensitivity of a Mach–Zehnder interferometer (MZI) using the superposition of ‘Schrödinger’s cat-like state with the vacuum state (SCVS)' and the vacuum state as inputs. With this setup, we examine the effect on the phase sensitivity of the interferometer using a parity detection scheme. We find better phase sensitivity under some conditions for this setup having potential application in quantum sensing. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Improvement on cyclic controlled teleportation by using a seven-qubit entangled state
(Springer, 2021) Vikram Verma; Dhiraj Yadav; Devendra Kumar Mishra
Recently, Sang [Int. J. Theor. Phys. 57, 3835–3838 (2018)] proposed a scheme for cyclic controlled quantum teleportation (CYCQT) of three arbitrary single-qubit states by utilizing a seven-qubit entangled state as the quantum channel shared by the four parties Alice, Bob, Charlie and David. In this scheme, single-qubit state is teleported by Alice to Bob, Bob teleports his single-qubit state to Charlie and Charlie teleports his single-qubit state to Alice. It is claimed that all the three participants Alice, Bob and Charlie cannot reconstruct the desired teleported state without the help of the controller David. Contrary to this, we show that the two involved participants Alice and Charlie can reconstruct the desired teleported state without the permission of controller. The controller David has no control over the teleportation processes Bob to Charlie and Charlie to Alice. To resolve this issue, we propose a modification to Sang’s scheme for CYCQT. Our scheme may play an important for secure quantum communication among the quantum nodes of a quantum network. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Mitigating sloppiness in joint estimation of successive squeezing parameters
(Institute of Physics, 2025) Priyanka Sharma; Stefano Olivares; Devendra Kumar Mishra; Matteo G. A. Paris
When two successive squeezing operations with the same phase are applied to a field mode, reliably estimating the amplitude of each is impossible because the output state depends solely on their sum. In this case, the quantum statistical model becomes sloppy, and the quantum Fisher information matrix turns singular. However, estimation of both parameters becomes feasible if the quantum state is subjected to an appropriate scrambling operation between the two squeezing operations. In this work, we analyze in detail the effects of a phase-shift scrambling transformation, optimized to reduce sloppiness and maximize the overall estimation precision using only classical probes. We also compare the optimized precision bounds of joint estimation with those of stepwise estimation methods, finding that joint estimation retains an advantage despite the quantum noise induced by the residual parameter incompatibility. Finally, we analyze the precision achievable by general-dyne detection and find that it approaches the optimal precision when one of the two squeezing amplitudes is large enough. © 2025 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
Non-classicalities exhibited by the superposition of Schredingera s cat state with the vacuum of the optical field
(IOP Publishing Ltd, 2021) Karunesh Kumar Mishra; Dhiraj Yadav; Gaurav Shukla; Devendra Kumar Mishra
Superposition of two coherent states, the Schrodingera s cat state, can exhibit different nonclassical properties having foundational applications in quantum information processing. We consider the a superposition of Schrodingera s catstate with the vacuum state (SCVS)a of the optical field. We discuss different witness of nonclassicality properties such as lower- A nd higher-order squeezing (viz., squeezing, Hong & Mandela s fourth-order squeezing, amplitude-squared squeezing) and subPoissonian photon statistics. Further, we discuss the negativity of the Wigner function of SCVS indicating the nonclassicality of the state under investigation. We find that the vacuum state contribution in SCVS exhibits different nonclassicalities under some conditions stronger where the nonclassicalities exhibited by the state without vacuum state contribution are weaker. © 2021 Institute of Physics Publishing. All rights reserved.
Optimizing phase sensitivity of Mach-Zehnder interferometer having superposition of coherent state with single-photon-added coherent state
(Elsevier B.V., 2025) Priyanka Sharma; Anand Kumar; Gaurav Shukla; Devendra Kumar Mishra
Precision measurement of an unknown parameter using a Mach-Zehnder interferometer (MZI) plays an important role in quantum metrology. We use hybrid coherent states (HCS), consisting of a superposition of coherent state (CS) and single-photon-added coherent state (SPACS), as well as solely CS, as inputs of the MZI. We computed the phase sensitivity of the MZI for three detection schemes: single intensity detection (SID), intensity difference detection (IDD), and optimal detection (OD). We find that HCS offers improved phase sensitivity under certain conditions, compared to CS combined with SPACS or double CS inputs and CS combined with the squeezed vacuum state as the input of MZI, under lossless and lossy scenarios. Also, we found that SID outperforms the IDD and OD schemes approximately in all cases. Furthermore, we explore the lower bound in phase sensitivity using quantum Fisher information (QFI) and the corresponding quantum Cramér–Rao bound (QCRB). We found that HCS with CS approaches the QCRB for SID and OD cases. Our results suggest that HCS could serve as a promising nonclassical resource for enhancing phase super-sensitivity in MZI, especially in realistic operational environments. © 2025 Elsevier B.V.
Quantum sub-phase sensitivity of a Mach–Zehnder interferometer with the superposition of Schrödinger's cat-like state with vacuum state as an input under product detection scheme
(Elsevier B.V., 2024) Gaurav Shukla; Dhiraj Yadav; Priyanka Sharma; Anand Kumar; Devendra Kumar Mishra
We study the phase sensitivity of a Mach–Zehnder interferometer (MZI) with product detection (PD) scheme by using the superposition of Schrödinger's cat-like state with the vacuum state (SCVS) and the coherent state as the inputs. We compare the results derived from PD with the parity detection scheme's results. We found that PD performs better than parity detection and approaches the single parameter quantum Cramér-Rao bound in some cases. Therefore, we expect that SCVS may play as an alternative quantum resource with PD for the improvement in the phase sensitivity of an MZI having potential application in quantum metrology and quantum sensing. © 2023
Quantum-enhanced super-sensitivity of a Mach–Zehnder interferometer with superposition of Schrödinger’s cat-like state and the Fock state as inputs using two-channel detection
(The Optical Society, 2022) Gaurav Shukla; Karunesh Kumar Mishra; Dhiraj Yadav; Ravi Kamal Pandey; Devendra Kumar Mishra
We study the improvement in the phase sensitivity of a Mach–Zehnder interferometer using the superposition of Schrödinger’s cat-like state with the Fock state (SCFS) and the coherent state as inputs. With this setup, we examine the effect on phase sensitivity of the interferometer using a two-channel detection (TCD) scheme [Opt. Express 29, 95 (2021)] in which we take the optimal combination of the intensities of both output ports. We find better phase sensitivity under some conditions for this setup as compared to other known combinations of inputs such as squeezed vacuum and coherent states, vacuum and coherent states, etc. Therefore, we expect that the SCFS may be an alternative nonclassical resource for improvement in the phase sensitivity of a Mach–Zehnder interferometer, having potential application in quantum sensing. © 2021 Optical Society of America
Super-resolution and super-sensitivity of quantum LiDAR with a multi-photonic state and binary outcome photon counting measurement
(Optica Publishing Group (formerly OSA), 2024) Priyanka Sharma; Manoj K. Mishra; Devendra Kumar Mishra
Here, we are investigating the enhancement in resolution and phase sensitivity of a Mach-Zehnder interferometer (MZI) based quantum LiDAR. We are using a multi-photonic state (MPS), superposition of four coherent states [Int. J. Quantum Inf. 19, 2150013 (2021)], as the input state and binary outcome parity photon counting measurement and binary outcome zero non-zero photon counting measurement as the measurement schemes. We have thoroughly investigated the results in lossless as well as lossy cases. We found enhancement in resolution and phase sensitivity in comparison to the coherent state and even coherent superposition state (ECSS) based quantum LiDAR. Our analysis shows that MPS may be an alternative nonclassical resource in the field of quantum imaging and quantum sensing technologies, like in quantum LiDAR. © 2024 Optica Publishing Group