Qubit Gate Operations in Elliptically Trapped Polariton Condensates

• URL: http://arxiv.org/abs/2309.17360v1
• Date: Fri, 29 Sep 2023 16:04:47 GMT
• Title: Qubit Gate Operations in Elliptically Trapped Polariton Condensates
• Authors: Luciano S. Ricco, Ivan A. Shelykh and Alexey Kavokin
• Abstract summary: We consider bosonic condensates of exciton-polaritons optically confined in elliptical traps. We describe a set of universal single-qubit gates resulting in a controllable shift of the Bloch vector. We discuss the applicability of our qubit proposal in the context of DiVincenzo's criteria for the realization of local quantum computing processes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We consider bosonic condensates of exciton-polaritons optically confined in elliptical traps. A superposition of two non-degenerated \textit{p}-type states of the condensate oriented along the two main axes of the trap is represented by a point on a Bloch sphere, being considered as an optically tunable qubit. We describe a set of universal single-qubit gates resulting in a controllable shift of the Bloch vector by means of an auxiliary laser beam. Moreover, we consider interaction mechanisms between two neighboring traps that enable designing two-qubit operations such as CPHASE, \textit{i}SWAP, and CNOT gates. Both the single- and two-qubit gates are analyzed in the presence of error sources in the context of polariton traps, such as pure dephasing and spontaneous relaxation mechanisms, leading to a fidelity reduction of the final qubit states and quantum concurrence, as well as the increase of Von Neumann entropy. We also discuss the applicability of our qubit proposal in the context of DiVincenzo's criteria for the realization of local quantum computing processes. Altogether, the developed set of quantum operations would pave the way to the realization of a variety of quantum algorithms in a planar microcavity with a set of optically induced elliptical traps.

Related papers

• Qubit Analog with Polariton Superfluid in an Annular Trap [0.0]
  We report on the experimental realization and characterization of a qubit analog with semiconductor exciton-polaritons. In our system, a condensate of exciton-polaritonsfluid is confined by a spatially-patterned pump laser in an annular trap. We observe coherent oscillations between a pair of counter-circulating superfluid vortex states of the polaritons coupled by elastic scattering off the laser-imprinted potential.
  arXiv  Detail & Related papers  (2023-08-10T13:13:37Z)
• Normal quantum channels and Markovian correlated two-qubit quantum errors [77.34726150561087]
  We study general normally'' distributed random unitary transformations. On the one hand, a normal distribution induces a unital quantum channel. On the other hand, the diffusive random walk defines a unital quantum process.
  arXiv  Detail & Related papers  (2023-07-25T15:33:28Z)
• A vertical gate-defined double quantum dot in a strained germanium double quantum well [48.7576911714538]
  Gate-defined quantum dots in silicon-germanium heterostructures have become a compelling platform for quantum computation and simulation. We demonstrate the operation of a gate-defined vertical double quantum dot in a strained germanium double quantum well. We discuss challenges and opportunities and outline potential applications in quantum computing and quantum simulation.
  arXiv  Detail & Related papers  (2023-05-23T13:42:36Z)
• Quantum Gate Generation in Two-Level Open Quantum Systems by Coherent and Incoherent Photons Found with Gradient Search [77.34726150561087]
  We consider an environment formed by incoherent photons as a resource for controlling open quantum systems via an incoherent control. We exploit a coherent control in the Hamiltonian and an incoherent control in the dissipator which induces the time-dependent decoherence rates.
  arXiv  Detail & Related papers  (2023-02-28T07:36:02Z)
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
  We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
  arXiv  Detail & Related papers  (2022-09-06T18:18:41Z)
• Strongly dipolar gases in a one-dimensional lattice: Bloch oscillations and matter-wave localization [0.0]
  Adding a one-dimensional optical lattice creates a platform where quantum fluctuations are still unexplored. We employ Bloch oscillations as an interferometric tool to assess the role quantum fluctuations play in an array of quasi-two-dimensional Bose-Einstein condensates. Long-lived oscillations are observed when the chemical potential is balanced between sites, in a region where a macrodroplet is extended over several lattice sites.
  arXiv  Detail & Related papers  (2022-05-06T15:05:36Z)
• Chaos in coupled Kerr-nonlinear parametric oscillators [0.0]
  We investigate complex dynamics, i.e., chaos, in two coupled nondissipative KPOs at a few-photon level. We conclude that some of them can be regarded as quantum signatures of chaos, together with energy-level spacing statistics.
  arXiv  Detail & Related papers  (2021-10-08T10:35:12Z)
• Robust Nonadiabatic Holonomic Quantum Gates on Decoherence-Protected Qubits [4.18804572788063]
  We propose a scheme for quantum manipulation by combining the geometric phase approach with the dynamical correction technique. Our scheme is implemented on the superconducting circuits, which also simplifies previous implementations.
  arXiv  Detail & Related papers  (2021-10-06T14:39:52Z)
• 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)
• Doubly geometric quantum control [0.0]
  In holonomic quantum computation, single-qubit gates are performed using driving protocols that trace out closed loops on the Bloch sphere. We present a general procedure that combines two types of geometry to design gates that simultaneously suppress pulse errors and transverse noise errors.
  arXiv  Detail & Related papers  (2021-03-14T20:41:37Z)
• Unraveling the topology of dissipative quantum systems [58.720142291102135]
  We discuss topology in dissipative quantum systems from the perspective of quantum trajectories. We show for a broad family of translation-invariant collapse models that the set of dark state-inducing Hamiltonians imposes a nontrivial topological structure on the space of Hamiltonians.
  arXiv  Detail & Related papers  (2020-07-12T11:26:02Z)

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.