Optimal Entanglement Witness for Cooper Pair Splitters

• URL: http://arxiv.org/abs/2110.04783v2
• Date: Wed, 22 Dec 2021 17:02:58 GMT
• Title: Optimal Entanglement Witness for Cooper Pair Splitters
• Authors: Minh Tam, Christian Flindt, Fredrik Brange
• Abstract summary: We formulate an entanglement witness that can detect the spin-entanglement using only three cross-correlation measurements of the currents. Our work paves the way for an experimental detection of the entanglement produced by Cooper pair splitters.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The generation of spin-entangled electrons is an important prerequisite for future solid-state quantum technologies. Cooper pairs in a superconductor can be split into separate electrons in a spin-singlet state, however, detecting their entanglement remains an open experimental challenge. Proposals to detect the entanglement by violating a Bell inequality typically require a large number of current cross-correlation measurements, and not all entangled states can be detected in this way. Here, we instead formulate an entanglement witness that can detect the spin-entanglement using only three cross-correlation measurements of the currents in the outputs of a Cooper pair splitter. We identify the optimal measurement settings for witnessing the entanglement, and we illustrate the use of our entanglement witness with a realistic model of a Cooper pair splitter for which we evaluate the cross-correlations of the output currents. Specifically, we find that the entanglement of the spins can be detected even with a moderate level of decoherence. Our work thereby paves the way for an experimental detection of the entanglement produced by Cooper pair splitters.

Related papers

• Steady-state dynamics and non-local correlations in thermoelectric Cooper pair splitters [43.62395775086322]
  Recent experiments on Cooper pair splitters using superconductor-quantum dot hybrids have embarked on creating entanglement in the solid-state. We present a comprehensive analysis of the fundamental components of the observed transport signal. Our work provides detailed insights into the gate voltage control of the quantum correlations in superconducting-hybrid Cooper pair splitters.
  arXiv  Detail & Related papers  (2024-06-10T06:46:10Z)
• Fermionic quantum computation with Cooper pair splitters [2.1770746401186933]
  We propose a practical implementation of a universal quantum computer that uses local fermionic modes (LFM) rather than qubits. The device layout consists of quantum dots tunnel coupled by a hybrid superconducting island and a tunable capacitive coupling between the dots. We show that coherent control of Cooper pair splitting, elastic cotunneling, and Coulomb interactions allows us to implement the universal set of quantum gates.
  arXiv  Detail & Related papers  (2023-09-01T13:26:40Z)
• Discriminating the Phase of a Coherent Tone with a Flux-Switchable Superconducting Circuit [50.591267188664666]
  We propose a new phase detection technique based on a flux-switchable superconducting circuit. The Josephson digital phase detector (JDPD) is capable of discriminating between two phase values of a coherent input tone.
  arXiv  Detail & Related papers  (2023-06-20T08:09:37Z)
• Entanglement generation and detection in split exciton-polariton condensates [3.473132078798784]
  We propose a method of generating and detecting entanglement in two spatially separated exciton Bose-Einstein condensates (BECs) at steady-state. We theoretically model and examine logarithmic negativity criterion and several correlation-based criteria to show that entanglement exists under experimentally achievable parameters.
  arXiv  Detail & Related papers  (2023-05-19T07:45:30Z)
• Dilute neutron star matter from neural-network quantum states [58.720142291102135]
  Low-density neutron matter is characterized by the formation of Cooper pairs and the onset of superfluidity. We model this density regime by capitalizing on the expressivity of the hidden-nucleon neural-network quantum states combined with variational Monte Carlo and reconfiguration techniques.
  arXiv  Detail & Related papers  (2022-12-08T17:55:25Z)
• Entanglement of Nambu Spinors and Bell Inequality Test Without Beam Splitters [9.47332522010253]
  We produce entanglement encoded in the Nambu spinor or electron-hole components of quasiparticles excited in quantum Hall edge states. Our work opens a new route for probing quasiparticle entanglement in solid-state physics exempt from traditional beam splitters.
  arXiv  Detail & Related papers  (2022-02-09T07:17:21Z)
• Condensation in hybrid superconducting cavity-microscopic spins systems with finite-bandwidth drive [0.0]
  We find conditions for non-equilibrium condensation in the open Tavis-Cummings model under a direct finite-bandwidth incoherent cavity drive. Results provide important guidelines for future quantum simulation experiments of non-equilibrium phases with hybrid devices.
  arXiv  Detail & Related papers  (2022-01-03T20:33:52Z)
• Visualizing spinon Fermi surfaces with time-dependent spectroscopy [62.997667081978825]
  We propose applying time-dependent photo-emission spectroscopy, an established tool in solid state systems, in cold atom quantum simulators. We show in exact diagonalization simulations of the one-dimensional $t-J$ model that the spinons start to populate previously unoccupied states in an effective band structure. The dependence of the spectral function on the time after the pump pulse reveals collective interactions among spinons.
  arXiv  Detail & Related papers  (2021-05-27T18:00:02Z)
• Observation-dependent suppression and enhancement of two-photon coincidences by tailored losses [68.8204255655161]
  Hong-Ou-Mandel (HOM) effect can lead to a perfect suppression of two-particle coincidences between the output ports of a balanced beam splitter. In this work, we demonstrate experimentally that the two-particle coincidence statistics of two bosons can instead be seamlessly tuned to substantial enhancement. Our findings reveal a new approach to harnessing non-Hermitian settings for the manipulation of multi-particle quantum states.
  arXiv  Detail & Related papers  (2021-05-12T06:47:35Z)
• Partitioning dysprosium's electronic spin to reveal entanglement in non-classical states [55.41644538483948]
  We report on an experimental study of entanglement in dysprosium's electronic spin. Our findings open up the possibility to engineer novel types of entangled atomic ensembles.
  arXiv  Detail & Related papers  (2021-04-29T15:02:22Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)

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.