Abstract
We report the experimental realization of high-fidelity photonic quantum gates for frequency-encoded qubits and qutrits based on electro-optic modulation and Fourier-transform pulse shaping. Our frequency version of the Hadamard gate offers near-unity fidelity (0.99998±0.00003), requires only a single microwave drive tone for near-ideal performance, functions across the entire C band (1530-1570 nm), and can operate concurrently on multiple qubits spaced as tightly as four frequency modes apart, with no observable degradation in the fidelity. For qutrits, we implement a 3×3 extension of the Hadamard gate: the balanced tritter. This tritter - the first ever demonstrated for frequency modes - attains fidelity 0.9989±0.0004. These gates represent important building blocks toward scalable, high-fidelity quantum information processing based on frequency encoding.
| Original language | English |
|---|---|
| Article number | 030502 |
| Journal | Physical Review Letters |
| Volume | 120 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jan 18 2018 |
Funding
We thank W. R. Ray for use of the optical spectrum analyzer and N. Lingaraju for helpful discussions regarding on-chip photonics. This work was performed in part at Oak Ridge National Laboratory, operated by UT-Battelle for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. Funding was provided by ORNL’s Laboratory Directed Research and Development Program and National Science Foundation Grant No. ECCS-1407620.
| Funders | Funder number |
|---|---|
| ORNL’s Laboratory Directed Research and Development Program | |
| National Science Foundation | ECCS-1407620 |
| U.S. Department of Energy | DE-AC05-00OR22725 |
| Directorate for Engineering | 1407620 |
| Oak Ridge National Laboratory | |
| UT-Battelle |