{"product_id":"cryoselle-abbess-of-the-twenty-millikelvin-mug","title":"Cryoselle, Abbess of the Twenty Millikelvin Mug","description":"\u003cp\u003eMean thermal photon number n̄ = 1\/(e\u003csup\u003ehf\/kT\u003c\/sup\u003e − 1). For a 5 GHz qubit mode at 20 mK, hf\/kT ≈ 12, so n̄ ≈ 6 × 10⁻⁶: the mode is almost always empty.\u003c\/p\u003e\n\u003cp\u003eThe joke: Only someone who has thermalised a qubit knows that 'quiet' means hf\/kT ≫ 1, not turning off the radio. The slogan on the mug reads \u003cstrong\u003ehf ≫ kT. FINALLY, SILENCE.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSource: M. Planck, Ann. Phys. 309, 553 (1901); S. N. Bose, Z. Phys. 26, 178 (1924). Value computed with exact SI h = 6.62607015×10⁻³⁴ J s and k = 1.380649×10⁻²³ J\/K (CODATA 2022).\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50976066437223,"sku":"83894615196601421220","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/8943168521930095667_2048.jpg?v=1793683508","url":"https:\/\/pixelatedphysics.com\/ko\/products\/cryoselle-abbess-of-the-twenty-millikelvin-mug","provider":"Pixelated Physics","version":"1.0","type":"link"}