Decoherence Mitigation with Local NOT Gates in Multipartite Systems

• URL: http://arxiv.org/abs/2604.23556v1
• Date: Sun, 26 Apr 2026 06:32:55 GMT
• Title: Decoherence Mitigation with Local NOT Gates in Multipartite Systems
• Abstract summary: We study the entanglement dynamics of $n=2,3,4$-qubit Bell- and GHZ-type states under an amplitude-damping channel (ADC)<n>For $2$-qubit states, we analyze the standard (Bennett) teleportation protocol.<n>For $3$- and $4$-qubit states, we study controlled quantum teleportation (CQT) with one and two emphcontrollers, respectively.
• Score: 2.076953181037131
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the entanglement dynamics of $n=2,3,4$-qubit Bell- and GHZ-type states under an amplitude-damping channel (ADC). We quantify multipartite entanglement using the genuine multipartite concurrence (GMC) and evaluate its utility through the optimal teleportation fidelity. For $2$-qubit states, we analyze the standard (Bennett) teleportation protocol. For $3$- and $4$-qubit states, we study controlled quantum teleportation (CQT) with one and two \emph{controllers}, respectively. Entanglement sudden death (ESD) denotes the abrupt, finite-time disappearance of entanglement caused by decoherence in contrast to asymptotic decay. To counteract ESD, we apply local NOT ($\hatσ_x$) operations on $m$ of the $n$ qubits ($m \leq n$) and derive analytic formulae, revealing that a single-NOT operation often suffices to alter ESD into asymptotic decay when handling GMC. In contrast, teleportation fidelity can decay more rapidly for single-NOT flipped states, whereas flipping all qubits is more useful for preserving teleportation fidelity in certain regimes, highlighting that the amount of entanglement alone does not guarantee teleportation utility. Remarkably, in the case of GHZ-type states, ADC-evolved mixed biseparable states can be exploited successfully in the CQT protocol. Further, using the GHZ-symmetric parametrization, we map the 2- and 3-qubit ADC-evolved mixed states onto a $(x,y)$ plane, revealing their SLOCC (Stochastic Local Operations and Classical Communication) entanglement classes. We also explicitly check the Bell-CHSH nonlocality hierarchy in the 2-qubit teleportation alongside localizable-entanglement diagnostics for 3-qubit CQT. Our results clarify the distinct roles of global versus localizable bipartite correlations and suggest simple, experimentally accessible unitary controls for preserving useful quantum resources in noisy channels.

Related papers

• Symmetric $N \ o M$ telecloning and remote quantum state inference [2.8201809312429744]
  We show that symmetric $N to M$ telecloning can be probabilistically performed using only sequential (or parallel) Bell state measurements.<n>When successful, the fidelity of each receiver's reduced state saturates the bound imposed by the no-cloning theorem.<n>Surprisingly, we uncover that, at a given of the protocol, pairwise entanglement is not always necessary to increase the teleportation fidelity.
  arXiv  Detail & Related papers  (2026-08-18T18:07:52Z)
• Performance of a two-mode coherent superposed channel in continuous-variable quantum teleportation [1.9643748953805937]
  We introduce a two-mode superposition operator $A=tab+radagger bdagger$, whose action on the two-mode coherent state produces the two-mode coherent superposed quantum state $ket=(tab+radagger bdagger)ket,$.<n>We compute the ideal teleportation fidelity for coherent and squeezed inputs and analyze how the strengths of nonclassicality and non-Gaussianity influence the teleportation efficiency.
  arXiv  Detail & Related papers  (2026-07-02T07:00:38Z)
• Quantum sensor network metrology with bright solitons [39.58317527488534]
  General Heisenberg Limit (GHL) characterizes fundamental limitations for unknown parameter measurement and estimation accuracy.<n>Three-mode soliton Josephson junction (TMSJJ) system as a three mode extension for the soliton Josephson junction (SJJ) bosonic model.<n>Our findings open new prospects for quantum network sensorics with atomtronic circuits.
  arXiv  Detail & Related papers  (2025-07-21T08:01:36Z)
• Toffoli and C$^\text{n}$NOT (n$>2$) gates in a neutral-atom platform using Rydberg coupling and dark state resonances [0.0]
  We propose a protocol for realizing a Toffoli gate using neutral-atom qubits in optical tweezers.<n>Our method relies on the strong and long-range interactions between atoms due to Rydberg excitations and the occurrence of dark states in the target qubit.
  arXiv  Detail & Related papers  (2025-07-03T11:13:42Z)
• SYK model based $β$ regime dependent two-qubit dynamical wormhole-inspired teleportation protocol simulation [0.0]
  This study aims to provide insights into various aspects of quantum chaos and teleportation by implementing the Wormhole-Inspired Teleportation Protocol (WITP)<n>We construct an analog of a traversable wormhole utilizing the Sachdev-Ye-Kitaev (SYK) model.<n>We compare the fidelity result with that of the Transverse Field Ising Model (TFIM)-based wormhole-inspired teleportation protocol.
  arXiv  Detail & Related papers  (2025-06-18T11:38:50Z)
• Quantum control landscape for generation of $H$ and $T$ gates in an open qubit with both coherent and environmental drive [57.70351255180495]
  An important problem in quantum computation is generation of single-qubit quantum gates such as Hadamard ($H$) and $pi/8$ ($T$) Here we consider the problem of optimal generation of $H$ and $T$ gates using coherent control and the environment as a resource acting on the qubit via incoherent control.
  arXiv  Detail & Related papers  (2023-09-05T09:05:27Z)
• A high on-off ratio beamsplitter interaction for gates on bosonically encoded qubits [40.96261204117952]
  A qubit in a high quality superconducting microwave cavity offers the opportunity to perform the first layer of error correction in a single device. We use a 3-wave mixing coupling element to engineer a programmable beamsplitter interaction between two bosonic modes separated by more than an octave in frequency. We then introduce a new protocol to realize a hybrid controlled-SWAP operation in the regime $g_bsapproxchi$, in which a transmon provides the control bit for the SWAP of two bosonic modes.
  arXiv  Detail & Related papers  (2022-12-22T18:07:29Z)
• The SWAP Imposter: Bidirectional Quantum Teleportation and its Performance [6.345523830122166]
  Bidirectional quantum teleportation is a fundamental protocol for exchanging quantum information between two parties. We develop two different ways of quantifying the error of nonideal bidirectional teleportation. We obtain semidefinite programming lower bounds on the error of nonideal bidirectional teleportation.
  arXiv  Detail & Related papers  (2022-10-19T20:43:57Z)
• Efficient Bipartite Entanglement Detection Scheme with a Quantum Adversarial Solver [89.80359585967642]
  Proposal reformulates the bipartite entanglement detection as a two-player zero-sum game completed by parameterized quantum circuits. We experimentally implement our protocol on a linear optical network and exhibit its effectiveness to accomplish the bipartite entanglement detection for 5-qubit quantum pure states and 2-qubit quantum mixed states.
  arXiv  Detail & Related papers  (2022-03-15T09:46:45Z)
• Realization of arbitrary doubly-controlled quantum phase gates [62.997667081978825]
  We introduce a high-fidelity gate set inspired by a proposal for near-term quantum advantage in optimization problems. By orchestrating coherent, multi-level control over three transmon qutrits, we synthesize a family of deterministic, continuous-angle quantum phase gates acting in the natural three-qubit computational basis.
  arXiv  Detail & Related papers  (2021-08-03T17:49:09Z)
• The Role of Localizable Concurrence in Quantum Teleportation Protocols [0.0]
  For mixed multi-partite states the lack of computable entanglement measures has made the identification of the quantum resource responsible for this advantage more challenging. We show that any teleportation protocol using an arbitrary multi-partite state, that includes a Bell measurement, requires a non-vanishing localizable concurrence between two of its parties in order to perform better than the classical protocol.
  arXiv  Detail & Related papers  (2021-06-12T01:00:52Z)
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler [40.456646238780195]
  Two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. We present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. We experimentally demonstrate CZ and $ZZ$-free iSWAP gates with two-qubit interaction fidelities of $99.76 pm 0.07$% and $99.87 pm 0.23$%, respectively.
  arXiv  Detail & Related papers  (2020-11-02T19:09:43Z)
• Quantifying the performance of bidirectional quantum teleportation [6.345523830122166]
  Bidirectional teleportation is a fundamental protocol for exchanging quantum information between two parties. We develop two ways of quantifying the simulation error of unideal bidirectional teleportation. We find semi-definite programming lower bounds on the simulation error of unideal bidirectional teleportation.
  arXiv  Detail & Related papers  (2020-10-15T17:36:17Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.