All-photonic GKP-qubit repeater using analog-information-assisted
multiplexed entanglement ranking
- URL: http://arxiv.org/abs/2303.14923v2
- Date: Mon, 27 Nov 2023 21:46:55 GMT
- Title: All-photonic GKP-qubit repeater using analog-information-assisted
multiplexed entanglement ranking
- Authors: Filip Rozp\k{e}dek, Kaushik P. Seshadreesan, Paul Polakos, Liang
Jiang, Saikat Guha
- Abstract summary: We propose a novel strategy of using the bosonic Gottesman-Kitaev-Preskill code in a two-way repeater architecture with multiplexing.
GKP qubits easily admit deterministic two-qubit gates, hence allowing for multiplexing without the need for generating large cluster states.
We show that long-distance quantum communication over more than 1000 km is possible even with less than 13 dB of GKP squeezing.
- Score: 2.4484807568823515
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Long distance quantum communication will require the use of quantum repeaters
to overcome the exponential attenuation of signal with distance. One class of
such repeaters utilizes quantum error correction to overcome losses in the
communication channel. Here we propose a novel strategy of using the bosonic
Gottesman-Kitaev-Preskill (GKP) code in a two-way repeater architecture with
multiplexing. The crucial feature of the GKP code that we make use of is the
fact that GKP qubits easily admit deterministic two-qubit gates, hence allowing
for multiplexing without the need for generating large cluster states as
required in previous all-photonic architectures based on discrete-variable
codes. Moreover, alleviating the need for such clique-clusters entails that we
are no longer limited to extraction of at most one end-to-end entangled pair
from a single protocol run. In fact, thanks to the availability of the analog
information generated during the measurements of the GKP qubits, we can design
better entanglement swapping procedures in which we connect links based on
their estimated quality. This enables us to use all the multiplexed links so
that large number of links from a single protocol run can contribute to the
generation of the end-to-end entanglement. We find that our architecture allows
for high-rate end-to-end entanglement generation and is resilient to
imperfections arising from finite squeezing in the GKP state preparation and
homodyne detection inefficiency. In particular we show that long-distance
quantum communication over more than 1000 km is possible even with less than 13
dB of GKP squeezing. We also quantify the number of GKP qubits needed for the
implementation of our scheme and find that for good hardware parameters our
scheme requires around $10^3-10^4$ GKP qubits per repeater per protocol run.
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