Kolli, A;
Lovett, BW;
Benjamin, SC;
Stace, TM;
(2006)
All-Optical Measurement Based QIP in Quantum Dots.
Phys. Rev. Lett.
, 97
(25)
, Article 250504. 10.1103/PhysRevLett.97.250504.
![[thumbnail of 264259.pdf]](https://discovery.ucl.ac.uk/style/images/fileicons/application_pdf.png) Preview |
PDF
264259.pdf Download (212kB) |
Abstract
Parity measurements on qubits can generate the entanglement resource necessary for scalable quantum computation. Here we describe a method for fast optical parity measurements on electron spin qubits within coupled quantum dots. The measurement scheme, which can be realised with existing technology, consists of the optical excitation of excitonic states followed by monitored relaxation. Conditional on the observation of a photon, the system is projected into the odd/even parity subspaces. Our model incorporates all the primary sources of error, including detector inefficiency, effects of spatial separation and non-resonance of the dots, and also unwanted excitations. Through an analytical treatment we establish that the scheme is robust to such effects. Two applications are presented: a realisation of a CNOT gate, and a technique for growing large scale graph states.
| Type: | Article |
|---|---|
| Title: | All-Optical Measurement Based QIP in Quantum Dots |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.97.250504 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.97.250504 |
| Language: | English |
| Additional information: | © 2006 The American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/264259 |
Loading...
Loading...Loading...| 1. |  China | 3 |
| 2. |  United States | 2 |
| 3. |  France | 1 |
Archive Staff Only
 |
View Item |
