Demonstration of fault-tolerant universal quantum gate operations
- URL: http://arxiv.org/abs/2111.12654v3
- Date: Wed, 2 Nov 2022 12:13:53 GMT
- Title: Demonstration of fault-tolerant universal quantum gate operations
- Authors: Lukas Postler, Sascha Heu{\ss}en, Ivan Pogorelov, Manuel Rispler,
Thomas Feldker, Michael Meth, Christian D. Marciniak, Roman Stricker, Martin
Ringbauer, Rainer Blatt, Philipp Schindler, Markus M\"uller, Thomas Monz
- Abstract summary: Quantum computers can be protected from noise by encoding the logical quantum information redundantly into multiple qubits.
Errors caused by imperfect operations do not spread uncontrollably through the quantum register.
We demonstrate a fault-tolerant universal set of gates on two logical qubits in a trapped-ion quantum computer.
- Score: 1.1817296279855427
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum computers can be protected from noise by encoding the logical quantum
information redundantly into multiple qubits using error correcting codes. When
manipulating the logical quantum states, it is imperative that errors caused by
imperfect operations do not spread uncontrollably through the quantum register.
This requires that all operations on the quantum register obey a fault-tolerant
circuit design which, in general, increases the complexity of the
implementation. Here, we demonstrate a fault-tolerant universal set of gates on
two logical qubits in a trapped-ion quantum computer. In particular, we make
use of the recently introduced paradigm of flag fault tolerance, where the
absence or presence of dangerous errors is heralded by usage of few ancillary
'flag' qubits. We perform a logical two-qubit CNOT-gate between two instances
of the seven qubit color code, and we also fault-tolerantly prepare a logical
magic state. We then realize a fault-tolerant logical T-gate by injecting the
magic state via teleportation from one logical qubit onto the other. We observe
the hallmark feature of fault tolerance, a superior performance compared to a
non-fault-tolerant implementation. In combination with recently demonstrated
repeated quantum error correction cycles these results open the door to
error-corrected universal quantum computation.
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