- 1Quantum Information and Computing Lab, Light and Matter Physics group, Raman Research Institute, Bengaluru, Karnataka, India
- 2Department of Physics, Indian Institute of Science, Bengaluru, Karnataka, India
- 3Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, India
- 4Center for Quantum Science and Technology, Siksha ‘O’ Anusandhan University, Bhubaneswar, India
- 5Department of Physics and Astronomy, University of Calgary, Calgary, AB, Canada
Quantum correlations between two or more different degrees of freedom of the same particle are sometimes referred to as intraparticle entanglement. In this work, we study these intraparticle correlations between two different degrees of freedom under various decoherence channels, viz. amplitude damping, depolarizing, and phase damping channels. We mainly focus on the amplitude-damping channel for which we obtain an exact analytical expression for the concurrence of an arbitrary initial pure state. In this channel, we observe the unique feature of entanglement arising from a separable initial state. We show that this channel allows for a revival of entanglement with an increasing damping parameter, including from a zero value of the concurrence. We also consider the amplitude-damping channel for interparticle entanglement and show that it does not display any of the above-mentioned interesting features. Further, for comparable parameters, the decay of entanglement in the interparticle system is much greater than in the intraparticle system, which we also find to be true for the phase damping and depolarizing channels. Thus, intraparticle entanglement subjected to damping is much more robust than interparticle entanglement.
1 Introduction
Entanglement can arise between two spatially separated particles or two different degrees of freedom of the same particle due to the nonseparability of the states in the Hilbert space. Interparticle entanglement refers to quantum correlations between two or more spatially separated particles in a single degree of freedom (Horodecki et al., 2009), while intraparticle entanglement refers to quantum correlations between two or more degrees of freedom of the same particle (Azzini et al., 2020; Basu et al., 2001). Intraparticle entanglement has been experimentally verified for various quantum systems (Michler et al., 2000; Gadway et al., 2008; Barreiro et al., 2005; Hasegawa et al., 2003; Shen et al., 2020). It is an important property for the testing of quantum contextuality and other various applications, such as quantum key distribution protocols (Sun et al., 2011; Adhikari et al., 2015), quantum teleportation protocols (Heo et al., 2015a; Pramanik et al., 2010; Heo et al., 2015b), entanglement swapping protocols (Adhikari et al., 2010), etc.
Any real-life applications of entanglement would suffer from interactions with a noisy environment. Thus, for realistic applications, it is imperative to investigate the nature of intraparticle entanglement in noisy channels. Furthermore, to find its efficacy, the same should be contrasted and compared with the decohering effects of noisy channels on interparticle entanglement, which have been systematically studied (Yu and Eberly, 2009; Almeida et al., 2007; Salles et al., 2008). Investigating intraparticle entanglement in noisy channels and comparing it with interparticle entanglement will help researchers in developing more robust quantum protocols and systems. This research is crucial for advancing applications like quantum key distribution, teleportation, and entanglement swapping, ensuring they can function effectively in real-world scenarios.
Previous studies of entanglement dynamics under decoherence have focused on interparticle systems. The main characteristic features observed in the dynamics of an interparticle system include entanglement sudden death (ESD) (Yu and Eberly, 2004; Yu and Eberly, 2005, Yu and Eberly, 2009; Almeida et al., 2007) followed by its revival and creation of entanglement, etc., that are rigorously (systematically) studied in the literature. The basic interpretation of entanglement revival in an interparticle system is based on the information backflow between the system and environment, that is, when the system is coupled to a non-Markovian environment. For such systems, the dynamics show entanglement revival even if the subsystems are noninteracting and independently coupled to local environments (Bellomo et al., 2007; D’Arrigo et al., 2014; Bellomo et al., 2008; Tong et al., 2010; Xu et al., 2010). However, the Markovian evolution of the system also shows entanglement revival for an interacting subsystem coupled to a common bath (Ficek and Tanaś, 2006; Ficek, 2010; Aolita et al., 2015). Similarly, the entanglement between two noninteracting qubits can be created by interaction with a common bath (Benatti et al., 2003; Mazzola et al., 2009; Braun, 2002; Benatti et al., 2010).
Intraparticle entanglement between different degrees of freedom (e.g., spin-path in neutrons) was experimentally demonstrated by Hasegawa et al. (2003), but its decoherence properties remained unexplored theoretically. Recent work by Shen et al. (2020) showed the robustness of neutron intraparticle entanglement between spin, path, and energy to experimentally verify quantum contextuality by violating Clauser–Horne–Shimony–Holt (CHSH) and Mermin inequalities but did not address the effect of any damping channels. Another recent work by De Moraes et al. (2020) shows that spin and pseudospin of electrons in graphene become strongly and dynamically entangled due to Rashba spin-orbit coupling, leading to a time-dependent violation of Bell inequalities. Here also, the effect of noise is not addressed. Our work provides a detailed theoretical analysis of noise by revealing that intraparticle entanglement exhibits ESD, followed by revival and creation of entanglement under an amplitude-damping channel.
In this work, the effects of noisy channels, namely amplitude damping, phase damping, and depolarizing channels, on the intraparticle correlations shared between degrees of freedom of a single particle are studied. The entanglement between two degrees of freedom is examined by calculating the concurrence as a function of the channel and input parameters. This study mainly focuses on the amplitude-damping channel, for which an exact analytical expression for the concurrence is obtained, revealing the very interesting phenomenon of the rebirth of entanglement as a function of the channel parameter. This result demonstrates that increasing noise, as quantified by the channel parameter, can counter-intuitively be beneficial for the generation of entanglement. This finding represents the central result of the work and offers a clear distinction between the effect of damping on intraparticle entanglement and the more conventional case of interparticle entanglement with non-Markovian noise (Bellomo et al., 2007). The behavior of intraparticle entanglement is explained through an extensive analysis of the concurrence in terms of the channel and input state parameters. Finally, the decoherence of intraparticle entanglement in the phase damping and depolarizing channels is investigated, and the results are contrasted with the interparticle entanglement scenario to demonstrate the robustness of intraparticle entanglement.
The damping is modeled using the Kraus operator formalism (Kraus et al., 1983), where the evolution of an initial state
This study considers a pure state of a single quantum system
with complex coefficients
Note that this structure is identical to the form of a pure state of two spatially separated particles, each with states in separate two-dimensional Hilbert spaces. Consequently, the formalism developed for calculating the concurrence of such systems can be applied to the present setup as well (Wootters, 1998). For an arbitrary bipartite quantum state
where the quantities
Here,
The intraparticle entanglement between two degrees of freedom for the pure state in Equation 1 is
When studying decoherence in systems with interparticle entanglement, environmental noise can either act locally on each particle’s state (Bellomo et al., 2007; D’Arrigo et al., 2014; Bellomo et al., 2008; Tong et al., 2010; Xu et al., 2010) or globally on their joint state (Ficek and Tanaś, 2006; Ficek, 2010; Aolita et al., 2015; Rao et al., 2008; D’Arrigo et al., 2013; Yeo and Skeen, 2003). Similarly, in the case of intraparticle entanglement—where different degrees of freedom within a single particle are entangled—the environment can influence each degree of freedom independently or act globally on their combined state.
In the present study, we focus on the latter scenario: a global noise channel that acts jointly on both degrees of freedom. This choice is motivated by the fact that both degrees of freedom originate from the same particle, making global interactions physically plausible. To the best of our knowledge, this global noise model for intraparticle entanglement remains largely unexplored in the literature. Nonetheless, it is important to acknowledge that in some situations, noise can affect individual degrees of freedom independently. For instance, in neutron interferometry, magnetic fields can induce spin decoherence without disturbing the path degree of freedom (Hasegawa et al., 2003). Such independent noise models could be explored in future work. In the case of intraparticle entanglement, we consider a noise model where noise treats the particle as a single entity and acts on the state of the particle as the quantum state of that single entity. Because the state of this single entity belongs to a higher four-dimensional system, that is, a qudit (d = 4), the noise also acts on the qudit.
2 Amplitude-damping channel
The amplitude-damping channel is a fundamental model of energy dissipation in a quantum system, typically describing spontaneous emission where a quantum system loses energy to its environment. In the context of intraparticle entanglement, this channel represents a process where the two internal degrees of freedom of a single particle collectively interact with the environment, causing transitions from excited states to a common ground state.
To model this process, the Kraus operator formalism is employed. Here, the evolution of an initial pure state
where
where
Because
where (Supplementary Material)
and
After substituting the expressions for
The above expression is a key result of this paper. If there is no noise (i.e.,
in terms of the amplitudes and phases of the coefficients
It can be seen that the concurrence is 0 when
The condition
The concurrence can go to 0 only when the condition in Equation 12 is satisfied. In Figure 2, one can observe three distinct evolutions of the concurrence represented by the blue, yellow, and green plots. These evolutions correspond to three different input states with state parameters that satisfy Equation 12. For other combinations of parameters, it can still have a minimum at a value

Figure 2. The variation of the concurrence with
With
In Figure 2, the red plot illustrates the evolution of the concurrence for an intraparticle entangled state with state parameters that do not conform to Equation 12, that is,

Figure 3. Variation of
Interparticle entanglement: Next, for the sake of comparison, we consider the decoherence of an interparticle entangled state
We consider a pure input state that has the same form as in Equation 1. The concurrence of the output state is
where
where

Figure 4. In this figure, the concurrence is plotted as a function of
Next, we compare the concurrence of intraparticle and interparticle entangled states with the same coefficients

Figure 5. In this figure, the concurrences for intraparticle entangled states and interparticle entangled states are plotted as a function of
Revival of interparticle entanglement is possible under special circumstances. Bellomo et al. (2007) showed a revival of interparticle entanglement under the non-Markovian dissipative amplitude-damping channel where the channel parameter takes a special form:
where
There are interesting works in the literature (Braun, 2002; Hamdouni et al., 2006; Ficek and Tanaś, 2006; Sun et al., 2007) on the revival of interparticle entanglement under decoherence. If we look carefully, we notice that in those works, the environment is a very large dimensional quantum system. These cases are markedly different from our cases, where the dimension of the Hilbert space of the environment is comparable to the Hilbert space dimension of the system. In our case, the environment’s dimension is not large; it matches the system’s dimension, which is 4. Interestingly, with this 4-dimensional environment, we observe the rebirth of intraparticle entanglement after ESD and the initial creation of entanglement from a separable initial state.
3 Other damping channels
We have investigated the effect of the phase damping and the depolarizing channels separately on a pure intraparticle entangled state
4 Future scope
In this study, we have conducted a theoretical examination of the decoherence behavior of a pure, generic intraparticle entangled state. Specifically, we analyzed how this state is affected by three different types of quantum noise channels: amplitude damping, phase damping, and depolarizing channels. It is important to note that our analysis is not tied to any particular physical implementation of an intraparticle entangled system. Instead, our findings are broadly applicable to any such system, regardless of the specific physical system details.
The focus of our theoretical analysis is to provide a general understanding of the decoherence mechanisms without being constrained by the peculiarities of a specific system. This generality allows our results to be versatile and widely applicable.
As a future scope, we can consider any physical system in which intraparticle states undergo decoherence and verify the results obtained for different damping channels. Our study aids in understanding the state parameters and in modeling experiments with reduced decoherence effects. This helps achieve intraparticle entangled states as an efficient resource, enabling researchers to design quantum systems more effectively, with minimal information loss, thereby ensuring the successful completion of quantum information tasks.
5 Concluding remarks
To conclude, we have studied the generation and decay of intraparticle entanglement under the amplitude-damping channel by calculating the concurrence. We obtain an exact analytical expression for the concurrence for an arbitrary initial pure state. The concurrence exhibits the interesting phenomenon of entanglement revival as a function of the damping parameter. We also calculate the concurrence as a function of the channel parameter for the more conventional case of interparticle entanglement and show that there is no revival of entanglement or, indeed, any non-monotonic dependence on the channel parameter. Thus, the intraparticle system displays the counterintuitive phenomenon of the growth of entanglement with increasing damping strength. We explain this in terms of the number of nonzero eigenvalues of the output density matrix. Furthermore, the entanglement decay is much greater for the interparticle than the intraparticle case for the same input state and channel parameter. We also study the effects of phase damping and the depolarizing channel for both the intraparticle and interparticle cases and find no evidence of entanglement revival in either. However, the decay of entanglement for comparable parameters is always greater for the interparticle case than the intraparticle case, consistent with our observations for the amplitude-damping channel. Thus, intraparticle entanglement is, in general, more robust than interparticle entanglement. While ESD and revival of entanglement after that are typically observed in systems coupled to very large environments, such as a common bath, our case is particularly interesting because the environment is a much smaller, four-dimensional system. Remarkably, even with this small environment, ESD and revival of intraparticle entanglement can still occur under the amplitude-damping channel. However, these phenomena are not observed for the phase damping and depolarizing channels.
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material; further inquiries can be directed to the corresponding author.
Author contributions
ASR: Validation, Formal analysis, Methodology, Investigation, Writing – review and editing, Writing – original draft. NC: Writing – review and editing, Methodology, Writing – original draft, Investigation. SM: Writing – original draft, Methodology, Validation. PP: methodology, Writing – original draft, Conceptualization. US: Funding acquisition, Writing – review and editing, Project administration, Writing – original draft, Supervision, Conceptualization, Validation, Investigation.
Funding
The author(s) declare that financial support was received for the research and/or publication of this article. US and ASR acknowledge partial support from the National Quantum Mission of DST. US and PKP acknowledge partial support from the DST-ITPAR grant IMT/Italy/ITPAR-IV/QP/2018/G. US acknowledges partial support provided by the Ministry of Electronics and Information Technology (MeitY), Government of India, under a grant for Centre for Excellence in Quantum Technologies with Ref. No. 4(7)/2020 – ITEA and QuEST-DST project Q-97 of the Government of India. SM acknowledges support from the QuEST-DST project Q-34 of the Govt. of India.
Acknowledgments
US and PKP acknowledge Dipankar Home, and PKP acknowledges Abhinash K Roy for many useful discussions.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Generative AI statement
The author(s) declare that no Generative AI was used in the creation of this manuscript.
Publisher’s note
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Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/frqst.2025.1592872/full#supplementary-material
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Keywords: intraparticle entanglement, interparticle entanglement, entanglement decoherence, revival of entanglement, amplitude-damping channel, phase damping channel, depolarizing channel
Citation: Sinha Roy A, C. V. N, Mukerjee S, Panigrahi PK and Sinha U (2025) Intraparticle entanglement in noisy quantum channels: degradation and revival through amplitude damping. Front. Quantum Sci. Technol. 4:1592872. doi: 10.3389/frqst.2025.1592872
Received: 13 March 2025; Accepted: 08 May 2025;
Published: 18 June 2025.
Edited by:
Shashank Virmani, Brunel University London, United KingdomReviewed by:
Abdulbast A. Abushgra, Ashland University, United StatesSoumya Das, Eindhoven University of Technology, Netherlands
Copyright © 2025 Sinha Roy, C. V., Mukerjee, Panigrahi and Sinha. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Urbasi Sinha, dXNpbmhhQHJyaS5yZXMuaW4=