Background Suppression in Quantum Sensing of Dark Matter via $W$ State Projection

• URL: http://arxiv.org/abs/2510.01816v1
• Date: Thu, 02 Oct 2025 09:01:09 GMT
• Title: Background Suppression in Quantum Sensing of Dark Matter via $W$ State Projection
• Authors: Shion Chen, Hajime Fukuda, Yutaro Iiyama, Yuya Mino, Takeo Moroi, Mikio Nakahara, Tatsumi Nitta, Thanaporn Sichanugrist,
• Abstract summary: We show that measuring dark matter signal by projecting quantum sensors in the collective excited state can highly suppress the non-collective noise background.<n>We trace the evolution of the sensors' state in the presence of both dark matter effect and sensors' decoherence effects.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We show that measuring dark matter signal by projecting quantum sensors in the collective excited state can highly suppress the non-collective noise background, hence improving the sensitivity significantly. We trace the evolution of the sensors' state in the presence of both dark matter effect and sensors' decoherence effects, optimizing the protocol execution time, and show that the suppression of background by a factor equal to the number of sensors is possible. This method does not require the entanglement of sensors during the signal accumulation time, hence circumventing the difficulty of maintaining the lifetime of the entangled state that is present in other enhancement proposals. This protocol is also general regarding the type of qubit sensors.

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