Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot

Abstract

We exploit the non-dissipative dynamics of a pair of electrons in a large square quantum dot to perform singlet-triplet spin measurement through a single charge detection and show how this may be used for entanglement swapping and teleportation. The method is also used to generate the AKLT ground state, a further resource for quantum computation. We justify, and derive analytic results for, an effective charge-spin Hamiltonian which is valid over a wide range of parameters and agrees well with exact numerical results of a realistic effective-mass model. Our analysis also indicates that the method is robust to choice of dot-size and initialization errors, as well as decoherence introduced by the hyperfine interaction.

5 pages, 3 figures

References in corpus (6)

• Quantum Computation with Quantum Dots
• Relaxation, dephasing, and quantum control of electron spins in double quantum dots
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Measurement-based quantum computer in the gapped ground state of a two-body Hamiltonian
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Cited by in corpus (4)

• Exchange-based two-qubit gate for singlet-triplet qubits
• Quantum Dot Spin Cellular Automata for Realizing a Quantum Processor
• Rashba controlled two-electron spin-charge qubits as building blocks of a quantum computer
• Quantum Gates Between Two Spins in a Triple Dot System with an Empty Dot